Airfoil for Mac: Play Audio on Multiple AirPlay Devices Simultaneously

hi, i really appreciate this airfoil app and bought the license both for my macbook pro and for my air. but there is a problem: the Instant On component. On the podcast you have just demonstrated that you opened airfoil speakers, then airfoil, and from there, audio source, selected airfoil speakers and you were ready to go. Of course you could not recover airfoil to its starting point, just for the demo. so you did not explain preliminary operations, such as choosing airfoil speakers as target application, and so on. well, when i told airfoil to use airspeakers, it asked me: close and relaunch, or install the Instant On component? i choose to install the Instant on component, and when typing the administrator password to finalize installation, it just stopped talking. VoiceOver and keyboard did not correctly respond to commands and I had to perform a force shutdown, that is, pressing the power button long till the computer stopped. this problem occurs both on uninstall and reinstall of Instant On component. did you get this problem too? how did you solve it? let me please know! thanks a lot

Hi,
In response to the previous commentor, I didn't get this problem using my Mac.

In addition, you can now use Raspberry Pis as additional airplay devices. I now have three audio sources scattered about the house, and it's pretty awesome when I start tidying the house (note the when).

Here's the link I followed:
http://raspberrypihq.com/how-to-turn-your-raspberry-pi-into-a-airplay-receiver-to-stream-music-from-your-iphone/

Only thing with the Pi, if you're using Shairport (which I recommend), make sure you fiddle with the frame buffer (-b). I'm playing with values >= 240. They seem to be about right, other wise the Pi plays before everything else. Not sure if that setting will be different depending on your network quality or whatever though.

HTH.