Airfoil 2.1.1 Manual

Airfoil v2.1.1
www.rogueamoeba.com

Welcome!
Airfoil is the first and best application enabling you to easily send any audio directly to your AirPort Express. Use it to transmit audio from RealPlayer, Windows Media Player, and many other applications. And now with Airfoil 2, you can send the same audio to multiple AirPort Express units - wire your whole house for sound, wirelessly!

New in 2.1.1
• Updated Instant Hijack to 2.0.3 - fixes a crash in ssh and related commands when using Mac OS X 10.5 (Leopard) with Apple Security Update 2008-002

New in Airfoil 2
+ Support for transmitting to multiple Airport Express units, in sync
+ Full support for four new device types. Transmit audio from:
-Dashboard Widgets
-RadioShark and DSB-R100 radios
-Audio devices
-All System Audio, using Soundflower
+ Audio effects to adjust and enhance audio quality
+ Support for sending audio to password-protected devices
+ Full Applescriptability
+ Brand New, sleeker user interface

Key Features
+ Airfoil allows you to send any audio to the AirPort Express
+ Send audio to multiple AirPort Express units simultaneously
+ Send audio from applications, widgets, radio devices like the RadioShark, and even audio devices to the AirPort Express
+ Send all system audio to the AirPort Express
+ Use plugins like Octiv's Volume Logic for iTunes with the AirPort Express
+ Optionally play audio to the AirPort Express and through local speakers as well, by adjusting Preferences

Feature Overview
In June of 2004, Apple unveiled their new AirPort Express wireless device, touting its new AirTunes feature. AirTunes allows speakers to be plugged in to the AirPort Express for remote music playing. The problem is, it only works with audio played via iTunes...until now.
With Airfoil, you can now grab audio from almost any application, and pass it on directly to the AirPort Express. iTunes is great, but it lacks the ability to play many popular audio formats. Now, you can use Airfoil to transmit audio from QuickTime, RealPlayer, Windows Media Player, MPlayer, and more. That's not all - with Airfoil 2, you can send audio to multiple sets of remote speakers at once, taking the AirPort Express beyond its original vision. Try it out, and you'll be amazed!

System Requirements
• A Macintosh computer
• OS X 10.4 or higher
• One or more AirPort Express units
• QuickTime 6.5.1 or higher

Installation And Removal
To install Airfoil, just drag it from your download folder to your Applications folder, or wherever you'd like to keep it.
To remove Airfoil, simply place it in the Trash. If you've installed any of the extra components, you may wish to uninstall them first using the Install Extras menu item in the Airfoil menu.

Purchasing
We provide a free trial of Airfoil for you to test. In its trial state, noise is overlaid on all transmissions longer than 10 minutes. The full version of Airfoil can be unlocked with a license key purchased from our online store.
When you're ready, head over to http://www.rogueamoeba.com/store/ to purchase Airfoil for just $25.

Contact:
Web: http://www.rogueamoeba.com/
Support: http://www.rogueamoeba.com/support/
E-Mail: airfoil@rogueamoeba.com
Purchase: http://www.rogueamoeba.com/store/

Airfoil is Copyright ©2004-2008, Rogue Amoeba Software, LLC

Upgrade To Airfoil 3
Airfoil 3
You're currently using Airfoil 2.1, the last planned version of Airfoil 2. We've already released Airfoil 3, chock full of new features. Airfoil 3 is a $10 upgrade if you already own Airfoil 2. It can be purchased through our store. Airfoil 3 is a major upgrade to Airfoil, bringing with it several big new features. We've streamlined the interface and redesigned the backend to support the AirTunes 2 protocol, providing for vastly improved audio transmission. Read on to learn more about the new features, or just check out the Airfoil page on our site. And remember, if you already own Airfoil 2, Airfoil 3 is just a $10 upgrade!
Perfect Synchronization
With Airfoil 3 and its support for the AirTunes 2 protocol, audio now plays to all remote AirPort Express units at exactly the same time. Airfoil 2 partially implemented this, but Airfoil 3 really nails it, providing perfect synchronization to multiple AirPort Express units just like iTunes.
Local Synchronization
And just like iTunes, with Airfoil 3, audio played locally plays in sync with remote audio too. No more delays - all your audio plays in perfect sync, everywhere.
Airfoil Speakers
Airfoil Speakers works just like a virtual AirPort Express, allowing you to send any audio to other local Macs in sync. Just run Airfoil Speakers on other computers throughout your house, and they'll show up in Airfoil, just like a standard AirPort Express. Now you can send any audio to other Macs, in addition to AirPort Express units!
Airfoil Video Player
With Airfoil Video Player, you can play video on your Mac and listen to audio remotely through your AirPort Express unit. Airfoil Video Player handles local video playback of many different video formats, along with preliminary support for DVD playback. Video is automatically synced with remote audio, for the perfect viewing experience.
Tutorials

This section of the Help will aid you in getting started with Airfoil. The easiest way to do this is to give simple walk-throughs, so that's just what we've done. Click on one of the sub-sections on the side to jump to your desired tutorial.

How To Transmit Audio To Your AirPort Express With Airfoil

Airfoil will allow you to send audio from any application to the AirPort Express. To do this, first open Airfoil. The main window contains all of the relevant controls for this setup.
The first thing to set is the desired audio source, in the Audio Device popup at the bottom of the window (labled with the number 3 above). This determines what audio will be sent to the AirPort Express. If, for example, you want to send a Real stream to the device, select RealPlayer.
Next, click the Transmit button next to each set of speakers to which you wish to send audio. These buttons are found in the Remote Speakers area, labeled with the number 1 in the diagram above.
Finally, play audio in the source, and it will flow out to the AirPort Express units. The output volume can be adjusted with the volume slider for each speaker. That's all there is to it!

Quick Review
Let's do a quick review of all that send audio to the AirPort Express with Airfoil.

1. Open Airfoil and select your audio source in Audio Source popup (3) at the bottom of the main window.
2. Click the Transmit button next to each set of speakers to which you want to send audio.
3. Play audio in the selected audio source and it will play out through the selected AirPort Express units. Enjoy!

Airfoil Interfaces

This section of the Help gives details on what each piece of Airfoil does. Click on one of the sub-sections to the left to jump to the specified window.
Main Window - The basic control window of Airfoil contains all its key settings.
Effects and Radio Windows - Airfoil's secondary control windows allow for audio adjustment and control of USB radio devices.
Other Windows - Information on the other minor windows in Airfoil.
Menu Reference - Explains what each and every menu item does in obsessive, boring detail.

Main Window

The main window in Airfoil contains all its essential controls. To send audio to an AirPort Express, select an audio source from the Audio Source Popup at the bottom. Then, click the Transmit button next to each AirPort Express to which you wish to send audio. Finally, play audio in the audio source, and it will be transmitted to the selected AirPort Express units.

Main Controls
Remote Speakers List - Displays all available AirPort Express units, as well as volume and transmission controls for each.
Level Meters - Meters showing audio activity for the currently active transmission.
Audio Source Popup - Sets the audio source from which Airfoil will pull audio.
Effects Button - Toggles visibility of the Effects window

Effects And Radio Windows

Effects Window
All effects are applied to audio as it transmitted out of Airfoil. Use Effects to adjust audio output through your AirPort Express units.
Volume - Adjust the volume of the audio. This slider goes up to 200% for "double gain", which may cause audible distortion.
Balance - Adjust the speaker balance from left to right. Defaults to Center.
Equalizer - Adjusts audio using the high-quality 10-band EQ, with Custom settings or many included presets.

Radio Window
The radio window in Airfoil allows for adjustment of USB radio sources, which can be a Griffin RadioShark or D-Link DSB-R100 radio.

Main Controls
Tuning Slider - Adjust the frequency to which the radio is tuned
AM/FM Toggle - Adjust the band on which the radio is receiving.

Other Windows

Help Window
You're looking at it. This displays the Airfoil Manual, and can be accessed by pressing Command-? or choosing 'Airfoil Manual' from the Help menu.

Registration Window
As seen above. Click 'Enter License' to enter a license for Airfoil, which may be purchased from our store, then click Print to make a copy for safekeeping. If you don't own a license, click Buy to purchase a code. If you've lost your license, click the 'I Lost My License' button.

About Window
Displays the credits for Airfoil.

Menu Reference

The following is a list of the relevant menu items in Airfoil including a short description of each item's function.

Airfoil Menu
About Airfoil - Shows Airfoil's credits
About Audio Devices - Opens Audio MIDI Setup, OS X's audio device management application
Check For Update - Checks via the Internet for updates to Airfoil
Preferences... - Opens Airfoil's Preferences window
License... - Opens Airfoil's License window
Install Extras... - Installs optional components for Airfoil, including the Instant Hijack component.
Hide Airfoil - Conceals all of Airfoil's windows
Hide Others - Conceals all other applications
Show All - Reveals all other applications
Quit Airfoil - Quits Airfoil

Speakers Menu
Transmit to All - Toggles Airfoil's transmission to all available speakers. If any speakers are off, this will activate them.
Transmit To X - Toggles transmission to a specific AirPort Express unit.
Link Volume to System - Links all volume sliders in Airfoil to the System volume level.
Volume Up - Increases the volume of all volume sliders in Airfoil.
Volume Down - Decreases the volume of all volume sliders in Airfoil.
Mute - Mutes the volume of all volume sliders in Airfoil.

Audio Menu
Monitor Locally - Toggles local playback of audio captured and transmitted by Airfoil. Because this audio is out of sync with remote playback, this option is off by default.
Advanced Source Settings... - Opens the Advanced window for select audio source types. See the Hidden Features page for more information.

Window Menu
Minimize - Minimizes the foremost window to the Dock
Close - Closes the foremost window
Bring All To Front - Brings all of Airfoil's windows forward
Airfoil - Opens the main Airfoil window
Effects - Opens Airfoil's Effects window

Help Menu
Airfoil Manual - Opens this help window
Contact Support... - Opens an in-application form that directly sends email to us for support
Visit RogueAmoeba.com... - Takes you to our homepage
Purchase Airfoil - Opens the Rogue Amoeba Store to purchase Airfoil.
Upgrade To Airfoil 3... - Opens the Airfoil 3 manual page, for information on upgrading - just $10!

Preferences

Interfaces:
Show:
Adjust the content of the Audio Source popup menu at the bottom of Airfoil's main window. All sources are on by default.
Applications - Toggles display of applications. It's unlikely you would want to turn this option off.
Widgets - Toggles display of widgets (OS X 10.4 and up only).
Audio Devices - Toggles display of audio input devices.
Radio Devices - Toggles display of radio devices such as the RadioShark.
System Audio - Toggles display of the System Audio output options, which requires SoundFlower. See the Install Extras... window under the Airfoil menu for more details.
Minimize To Menu Bar:
When active on OS X 10.4, Airfoil will be minimized to the Menu Bar instead of the Dock. Option-clicking the minimize button reverses this behavior.

Automatic Speakers:
Automatically transmit to: - When launched, Airfoil will immediately begin transmitting audio from the last selected application to the selected remote speakers. Uncheck all boxes to turn off automatic transmission of audio.

Speaker Synchronization And Playback
Total Synchronization - When selected, Airfoil will manipulate audio in largely inaudible ways to keep playback between multiple units synchronized. This is the default and recommended setting for multiple speaker setups.
Pure Playback - When this option is selected, audio will be sent to the AirPort Express with absolutely no manipulation. Airfoil will not attempt to keep playback between multiple units synchronized.

Software Update:
Automatically check for updates - With this on, Airfoil compares its own version number with the most current version available from our server. Please leave this on to stay up-to-date.

Hidden Features
Airfoil has a few features of which you may not be aware. Read this page for details on some of the lesser-known features of Airfoil.

Monitoring Output Locally
With Airfoil, you can play audio remotely, and locally as well. This option is off by default, as local audio will be out of sync with remote playback. If you'd like to turn this option on, select 'Monitor Locally' from the Audio menu in Airfoil.

Transmitting Audio From Previously Open Applications
By default, Airfoil must relaunch applications to grab their source audio. With the Instant Hijack component installed, Airfoil can pull audio from applications which are already open. To learn more, see the "Install Extras..." menu option in the Airfoil menu.

Transmitting Audio From Hidden Applications
Airfoil can transmit audio from some hidden applications, but they don't show up in the ordinary Audio Source popup menu at the bottom of Airfoil's main window. To view these hidden applications, hold down the option key when you click the menu.

Minimize Behavior
By default, Airfoil will minimize to the Dock. By adjusting the Preferences, Airfoil can be made to minimize to the Menu Bar. To reverse the currently-set behavior, hold down option when minimizing.

Advanced Hijacking Options

This sheet allows access to the Advanced Hijacking options. To access it, select Advanced Source Settings... in the Audio menu when an application is set as the audio source. Most of these settings should be left at their defaults, but adjusting the Stream Index may allow you to receive audio from applications from which Airfoil ordinarily does not receive audio.
Hijack Settings
Stream Index: Adjusting the Stream Index may allow you to receive audio from applications which output audio in a non-standard way.
Fill Gaps: Adjust this to stop the stream when no audio is coming from the source, or to add Silence, Light Noise, or Heavy Noise to it. By default, Silence is added so that the connection to the AirPort Express is maintained.
Device Settings
Target Device: This allows you to select the specific device with which the source is associated.
Left Channel: For devices with more than two channels, you can select the channel which will serve as the left.
Right Channel: For devices with more than two channels, you can select the channel which will serve as the right.

Advanced Device Controls

This window allows Advanced Device options. To access it, select Advanced Source Settings... in the Audio menu when an audio device is set as the audio source. As above, most of these settings should be left at Default.

Input Device Settings
Device: Displays the device name selected in the main window for the input.
Left Channel: For devices with more than two channels, select the channel which will serve as the left.
Right Channel: For devices with more than two channels, select the channel which will serve as the right.
Buffering: Adjusts the size of the audio buffer for the input, in frames. A larger buffer is less prone to skipping but has higher latency (delay), while a smaller buffer has lower latency but may be more prone to skipping. This is best left at Default to start.

Output Device Settings
Device: Displays the device name selected in the main window for the output.
Left Channel: For devices with more than two channels, select the channel which will serve as the left.
Right Channel: For devices with more than two channels, select the channel which will serve as the right.
Buffering: Adjusts the size of the audio buffer for the output, in frames. A larger buffer is less prone to skipping but has higher latency (delay), while a smaller buffer has lower latency but may be more prone to skipping. This is best left at Default to start.

Debugging

The Debugging dialog can be accessed by holding down the option key as Airfoil launches. If a problem occurs, these debugging options may help show what's wrong.

Hidden Preferences
registrationObscured: This preference controls the visibility of the registraion code in the Registration window. If you're in a group environment, you may wish to obscure this code to prevent theft.
The example command below for the Terminal will cause the code to be obscured in the Registration window.
defaults write com.rogueamoeba.Airfoil registrationObscured NO

Known Issues In Airfoil

Airfoil goes through rigorous design and testing before it ever gets released. However, issues can arise which can't or won't be worked around, at least not presently. Read on for more information.
Audio Delays: Delays are inherent in transmitting to the AirPort Express. This is an issue with the AirPort Express hardware, and unfortunately there is no way around this.
802.11b: When using Airfoil on an 802.11b (AirPort) network, instead of an 802.11g (AirPort Extreme) network, remote playback may skip or stall, as the network is not fast enough to allow for proper playback. You may inadvertently create an 802.11b network by adding an 802.11b device, such as an older Mac, or a very old AirPort Base Station. If possible, set your network to only run as 802.11g in the AirPort Admin Utility application.
Fast User Switching: Because audio playback can behave in unexpected ways when switched out of an account, Airfoil is not supported for use when switching between users with Fast User Switching.

Purchasing Airfoil

Quick Link: To buy a license key for Airfoil, visit our online store.

Why should I buy Airfoil?
Put simply, you should buy Airfoil because it isn't free - we give you a chance to test out the program and all its features before you buy it. It's like test driving a car, for as long as it takes you to decide.
In trial mode, all of Airfoil's features are available to try, but it won't work for full-time use. Until you purchase, noise will be overlaid on all audio Airfoil transmits after ten minutes.
If you use Airfoil and find you like it, please purchase a license key and support Rogue Amoeba. You'll be allowing us to continue to bring some of the world's best software products into existence.

What does Airfoil cost?
A license key for Airfoil costs just $25. Our prices are so low, they're affordable!

How do I buy Airfoil?
To purchase your license key, just visit http://www.rogueamoeba.com/store/.

After Purchase

How does purchasing work?
When you purchase through our store, you'll immediately receive a license key in your your browser, as well as via email. This key will allow you to unlock the full version of Airfoil. Simply enter your key into Airfoil as instructed, and you'll be all set.

Can I use my license key on multiple machines?
A license key for Airfoil provides 1 "seat". This allows for a single copy to be in use at one time. If you own multiple personal machines, you may install and unlock Airfoil on them, provided it is only in use on one machine at a time. If you need to use Airfoil simultaneously on multiple machines, you'll need to purchase multiple license keys.

What's your upgrade policy?
Rogue Amoeba doesn't have a stated upgrade policy, just a great track record. In five years and across our entire product line, we've provided almost a dozen major updates and over 100 updates total, free of charge. If we add substantial new functionality, we may charge an upgrade fee. However, we do not make most of our income from recurring sales, and we provide nearly all updates free of charge, including both bug fixes and new features.

What's your refund policy?
All Rogue Amoeba products are available as demos for an evaluation prior to purchase. We believe that no customer should have to buy software in order to find out how well it works. Our software can be fully evaluated with no limitations in capabilities, prior to purchase. Customers are strongly encouraged to take advantage of these trials prior to purchase. You may also seek any needed technical support from us - we answer support emails rapidly and responsively for current and potential customers alike.
If you would like a refund, please contact hello@rogueamoeba.com within 14 days of your purchase. Because we can not recover the license key that was sold, refunds are issued on a case-by-case basis.

Advanced Topics

The following pages will assist you with many common but advanced questions and problems. If you have an issue, read over the relevent article for more information on the topic. If none of the Advanced Topics articles address your problem or question, please (please!) email us for support. Send mail to airfoil@rogueamoeba.com and we'll work to get your issue solved.

Basic Troubleshooting

This page will assist you with any basic problems you're having with Airfoil. Follow the steps in this troubleshooting guide and your problem may disappear. After each step, test Airfoil again.

Connection Troubleshooting

If you're having problems connecting to remote speakers or staying connected, please follow these steps.

Test iTunes
First, test iTunes with the remote speakers. If iTunes can't find the remote speakers, or can't connect to them, Airfoil won't be able to either. You'll need to figure out the issue with your network before Airfoil will work.

Check The Firmware
Check that the firmware on your AirPort Express is fully up-to-date. Open AirPort Admin Utility in your Applications->Utilities folder, and check the firmware. As of this printing (February 2006), 6.3 is the most current firmware for the AirPort Express.

Reduce Network Traffic
Airfoil needs to use a fairly large amount of bandwidth when communicating with the AirPort Express. If other processes on your network are using too much bandwidth, the connection may skip or fail. To avoid this, reduce network traffic.

Use 802.11g
802.11g, or AirPort Extreme, allows for the fastest connection to the AirPort Express. Using 802.11b, the original AirPort found in older machines will usually not be fast enough for audio transmissions. Be sure to use 802.11g with Airfoil, and be aware that having any 802.11b machines on the network will slow everything down to 802.11b speeds.

Basic Troubleshooting

Update
Be sure you're using the latest version of Airfoil. Check by using the 'Check For Update' command in the Airfoil menu.

Reset the AirPort Express
Sometimes the AirPort Express unit itself will have an issue. The best way to fix this is to reset the unit, by pressing and holding the small reset button on the AirPort Express, next to the audio jack.

Delete Preferences
Try the old OS 9 standby of deleting the application's preferences. On your OS X hard drive, go to your User folder and open Library/Preferences (~/Library/Preferences) and delete the file "com.rogueamoeba.Airfoil.plist".

Check for a messages from Airfoil
Did Airfoil give you any error messages? If so, pay attention to them! These error messages are designed to tell you something is wrong, and to help us diagnose the problem if you can't fix it. You may also see error messages if you check Console.app (located in /Applications/Utilities/Console).

If all else fails...
If these steps haven't fixed your problem, please check the online FAQ, then email us for support. Send mail to airfoil@rogueamoeba.com, and we'll try to get your issue solved.

Using Airfoil With Web-based Audio

Often, audio is playing directly in your web browser, and not in a separate audio player. Airfoil can transmit this audio to your AirPort Express just fine, provided you select the proper source. In these cases, you need to select your browser (likely Safari) as the source, as seen here:

Some examples of web-based audio for which you need to select your browser as the audio source include:
Pandora.com
Rhapsody
Last.fm
XM.com
Wolfgang's Vault.com
and many others.

Scripting Airfoil via AppleScript

Scripting via AppleScript

Beginning with version 2.0, Airfoil supports a full AppleScripting suite. Just about anything you can do with the graphical user interface, you can now also script. The following is a brief overview of the object model that Airfoil exposes. For a complete reference, see Airfoil's Scripting Dictionary in Script Editor. If you are new to AppleScript, we recommend you pick up a copy of AppleScript : The Definitive Guide by Matt Neuburg, before proceeding.

1. Accessing and Controlling Speakers
2. All About Audio Sources
3. Audio Sources Types
4. Putting it all Together

Accessing and Controlling Speakers

The primary object in Airfoil, is the speaker. It represents an Aiport Express on the network, which you can start and stop and set the volume of. Before that though, we need to actually retrieve a speaker instance on which to operate on. Airfoil maintains a list of avaliable speakers on the application object.

tell application "Airfoil" get first speaker --speaker id "0011245FA40D" get every speaker --{speaker id "0011245FA40D", speaker id "001124000AE3"} get every speaker whose name is "Kitchen" --{speaker id "001124000AE3"} end tell

Once we have a speaker, we can set it's volume, or connect/disconnect from it. Here's an example script that toggles the connection to the first speaker found:

tell application "Airfoil" set aSpeaker to first speaker if not (connected of aSpeaker) then set (volume of aSpeaker) to 0.5 connect to aSpeaker else disconnect from aSpeaker end if end tell

All About Audio Sources

Beyond controlling the speakers, Airfoil's AppleScript dictionary gives you complete control over the audio source used. The five types of audio sources are all represented: application source, widget source, device source, radio source, and system source.

Application sources represent an application on the hard disk. To target an application source, you create a new instance, set it's application file property to the full POSIX path of an application, and then set the application's current audio source to it:

tell application "Airfoil" set aSource to make new application source set application file of aSource to "/Applications/iTunes.app" set current audio source to aSource end tell

Device sources represent hardware audio devices such as microphones or line-in ports. Airfoil maintains a list of device sources from which you can select, and then target. The following example script displays a "choose from list" dialog with every audio device in it:

tell application "Airfoil" set listOfDevices to name of every device source set selectedDevice to choose from list listOfDevices with prompt "Choose an audio device:" set aSource to first device source whose name is (first item of selectedDevice) set current audio source to aSource end tell

radio sources represent hardware AM/FM radios such as the RadioSHARK or D-Link DBR-100. Like device sources, Airfoil maintains a list of connected radio devices that you can choose from. The radio device can be tuned by using the band and frequency properties:

tell application "Airfoil" set aSource to first radio source set band of aSource to FM set frequency of aSource to 770000 -- 770 AM set frequency of aSource to 89900000 -- 89.9 FM set current audio source to aSource end tell

If you have the Soundflower extra installed, you can use the system sources to transmit all audio from the computer. Naturally, there is only ever one System Audio source:

tell application "Airfoil" set aSource to first system source set current audio source to aSource end tell

Putting it all Together

Finally, heres a complete script showing a typical usage of Airfoil. We find a target application, create a new application source for it, and then transmit it to a speaker.

tell application "Airfoil" --Find QuickTime Player set pathToApp to (POSIX path of (path to application "QuickTime Player")) --Create a new source and set it to QT set newSource to make new application source set application file of newSource to pathToApp --Set the source set (current audio source) to newSource --Set the speaker volumes set (volume of every speaker) to 0.5 --And finally start transmitting connect to every speaker end tell

Appendix

The following pages contain additional information that may prove useful to some users. It is not, however, required or even recommended reading, and thus it has been placed at the end of this manual.
Version History - Details the complete history of changes since Airfoil 1.0

Airfoil Version History
Version History

Airfoil v2.1.1
Released 03.19.2008
• Updated Instant Hijack to 2.0.3 - fixes a crash in ssh and related commands when using Mac OS X 10.5 (Leopard) with Apple Security Update 2008-002

Airfoil v2.1
Released 02.01.2008
• Full support for Mac OS X 10.5 (Leopard), including Instant Hijack support
• Instant Hijack 2, with Leopard support, MultiHijack, and more
• Now uses Sparkle for version updates
• Updated Soundflower to 1.3, now with Volume support
◊ Fixed possible hijack failure when hijacking Rosetta applications
◊ Application icon now avaliable in 512px for Mac OS X 10.5 (Leopard)
◊ Fixed possible corrupt audio bug when hijacking using MegaMix
◊ Can now hijack non-WindowServer based processes with Instant Hijack
◊ Hijacking of FrontRow.app now works as expected on 10.5 (requires Instant Hijack)
◊ Instant Hijack 2.0.1

Airfoil v2.1 Preview
Released 10.24.2007
+ Various bug fixes and improvements for Mac OS X 10.5 (Leopard)
+ Instant Hijack 1.5 (Currently only for Mac OS X 10.4 (Tiger))
+ Hijacking: Now supports MultiHijack (hijacking the same program more than once)
- Hijacking: Improved MegaMix options
- Hijacking: Mute now supported in MegaMix mode
- Other: Revised Help menu
- Other: Now requires Mac OS X 10.4+

Airfoil v2.0.8
Released 07.11.2007
- Now accepts TX40- license key prefix
- No longer improperly accepts HLFZ- prefix

Airfoil v2.0.7
Released 04.17.2007
+ Improved connection reliability
+ Now includes SoundFlower 1.2.1
- Improved error reporting on failed connections
- Updated to RASN2 License Key System

Airfoil v2.0.6
Released 02.01.2007
+ Now includes SmartCrashReporter 1.2.1
- More robust connection opening
- Now supports connections over IPv6
- Increased network timeout limit
- Fixed CPU usage bug where the EQ would consume large amounts of processor time
- Improved behavior of the Mute menu item
- AppleScript now allows the audio source to be dynamically switched

Airfoil v2.0.5
Released 10.08.2006
Major bug fix update
-Fixed bug causing some audio to skip
-Fixed bug where transmissions would fail to initiate

Airfoil v2.0.4
Released 10.05.2006
+ MegaMix Mode - Auto-enabled for web browsers and VOIP
+ Improved RadioShark support
-RadioShark 2 Support
-Miscellaneous bug fixes
-Bug Fixes
-Fixed bug where Airfoil would refuse to Quit
-Other minor fixes
-Extras
-Updated Instant Hijack to v1.4
-Updated Soundflower to v1.2
-Other
-New About Box

Airfoil v2.0.3
Released 06.05.2006
+ Audio Sources can now be changed on-the-fly
+ Optional Minimize To Menu Bar preference, to place Airfoil in the Menu Bar instead of the Dock (OS X 10.4 only)
+ Updated to Instant Hijack 1.3.3 with full Intel Chip-Based Mac (ICBM) support
+ Updated to Smart Crash Reports 1.2 with full ICBM support
+ Updated to Application Enhancers 2

Airfoil v2.0.2
Released 03.13.2006
+ Official Intel Chip-Based Mac (ICBM) support
+ Can now pull audio from applications running under Rosetta emulation
- Smart Crash Reports version 1.1 beta 1
- Updated to Instant Hijack Server 1.3.2 (PPC Only)
- Volume menu items now adjust relatively
- RadioShark tuning now closer to offical Griffin tuning
- Now properly alerts when noise is overlaid, in unregistered mode
- Improved orderly disconnects
- Better handling when sleep occurs
- More widget hijacking bug fixes

Airfoil v2.0.1
Released 01.20.2006
+ Airfoil is now a Universal Build, working on Intel Macs
- Fixed rare audio Effects bug, where effects had no effect
- Widget hijacking bug fixes
- RadioShark tuning tweaks
- Audio Devices no longer incorrectly revert to "Default System" anymore
- Now requires 10.3.9

Airfoil v2.0.0
Released 01.07.2006
+ Full overhaul - it's all new!

Airfoil v1.0.6
Released 08.11.2005
- Fixed bug with unexplained lost connections
- Fixed bug with systems where IPv6 is enabled
- Fixed compatibility bug with some machines running AirPort 4.2

Airfoil v1.0.5
Released 04.21.2005
+ Dock menu additions
+ Preferences additions (Start transmit on launch)
+ Now supports D&D of apps into window
- Updates to fix broken zeroconf names
- Improved compatibility of 'Link to System Volume'
- Now watches for QuickTime 6.5.1 (required)
- Ceases transmit on machine sleep.
- More fixing of audio droputs
- Fixed a bug where a device would be mistakenly thought to be password protected
- Improved exception logging

Airfoil v1.0.1
Released 03.04.2005
-Now properly opens application window when clicked in Dock
+ Several bug fixes, including
- Sample rate bug (causing audio speed-ups and slow-downs)
- 'Internal Error' objectAtIndex
- Connection issues

Airfoil v1.0
Released 03.01.2005
+ First release - it's all new.

Credits, Licenses, Contacts and All The Fun That Involves

We now present the conclusion to the Airfoil Manual, on the Rogue Amoeba Tuesday Late Late Late Night Movie.
User License - Let your lawyer explain it all to you.
Licensing - Information about licensing the technology upon which Airfoil is built.
Contact - How to get in touch with Rogue Amoeba.
Acknowledgements - We couldn't have done it without them.

Airfoil - Give Your Audio Wings
License

Distribution
Unless explicitly stated in writing, Rogue Amoeba Software does not grant permission to sell Airfoil ("The Software"). Non-profit distribution of The Software in its trial form is acceptable provided that The Software is not modified in any way, and the complete works of The Software are included in the distribution package. If The Software is to be included in a distribution package, Rogue Amoeba requests but does not require that one complimentary copy of said package, sent to the following address:

Rogue Amoeba Software
Marketing Department
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Cranbury, NJ 08512
What that said: Don't sell this software directly for profit. If you want to distribute it, great! Just make sure it's unmodified from the download from our site. If you create a distribution package, it'd be cool if you sent a copy to the address above, though this is not required.

Refunds
All Rogue Amoeba products are available as demos for an evaluation prior to purchase. We believe that no customer should have to buy software in order to find out how well it works. Our software can be fully evaluated with no limitations in capabilities, prior to purchase. Customers are strongly encouraged to take advantage of these trials prior to purchase. You may also seek any needed technical support from us - we answer support emails rapidly and responsively for current and potential customers alike.
If you would like a refund, please contact hello@rogueamoeba.com within 14 days of your purchase. Because we can not recover the license key that was sold, refunds are issued on a case-by-case basis.
What that said: We want you to be happy, so we enable you to test drive our software. If you have any questions, let us know before you buy, we're happy to help. Refunds may be issued within 14 days of purchase, at our discretion.

Disclaimer
Airfoil ("The Software") is provided as is. Rogue Amoeba Software ("The Author") is not responsible for any damage to the user's computer system or data and in no event will The Author, its officers, directors, employees or agents be responsible to the user for any consequential, incidental, or indirect damages (including damages for loss of business profits, business interruption, lost of business information, and the like) arising out of the use or inability to use the The Software, even if The Author has been advised of the possibility of such damages. Because some states do not allow the exclusion or limitation of liability for consequential or incidental damages, the above limitations may not apply to you. Further, the consumer agrees that using this software in any way illegal, or even for the purposes of assessing its viability for illegal usage, is prohibited.
What that said: Be safe when you use the software. Be aware that it's simply a tool designed to make your life better. Don't use it to do illegal or evil things. If you do, be ready to take responsibility for your own actions.

Licensing

Audio Hijack Technology
Airfoil is built on Audio Hijack technology, the same technology powering many of our products. We have several technologies that have been adapted for licensing. For more details, see our online licensing page.

Contacts

Airfoil Homepage
http://www.rogueamoeba.com/airfoil
Rogue Amoeba Homepage
http://www.rogueamoeba.com
Buying Airfoil
Visit our online store or see the Purchasing page.
Airfoil Support
airfoil@rogueamoeba.com Be sure to look over the Known Issues page, and the support center first.
Join the Rogue Amoeba low-traffic announcement list. There's no spam, EVER. It's as simple as that.
http://www.rogueamoeba.com/company/lists/maclist.php

Acknowledgments
Portions of this Rogue Amoeba software may utilize the following copyrighted material, the use of which is hereby acknowledged.
Perian QuickTime component ( perian )
Copyright © 2006 Perian Project
Parts of this product contain certain software owned by Perian Project and licensed by Rogue Amoeba. You may obtain a complete machine-readable copy of the source code of the Perian software under the terms of GNU Lesser General Public License Version 2.1 ("LGPL"), without charge at http://www.rogueamoeba.com/sources/ or by contacting sources@rogueamoeba.com. The Perian software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LGPL for more details; a copy of the LGPL is included below.

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>     That's all there is to it!

SoundTouch audio processing library ( soundtouch )
Copyright © 2002-2005 Olli Parviainen
Parts of this product contain certain software owned by Olli Parviainen and licensed by Rogue Amoeba. You may obtain a complete machine-readable copy of the source code SoundTouch software under the terms of GNU Library General Public License Version 2 ("LGPL"), without charge at http://www.rogueamoeba.com/sources/ or by contacting sources@rogueamoeba.com. The SoundTouch software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LGPL for more details; a copy of the LGPL is included below.

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