Can anyone help with this? My MacBook Air has a problem with Airplay in Garageband. It isn't that it isn't working, but the volume is so low I can hardly hear it. The track meters and master volume are all corrent levels, maximum in the green part of the meter, and it is receiving input from a USB keyboard. No problem when I use the internal speakers. Strangely, Airplay works perfectly in iTunes, so it seems it isn't a problem with the computer, but some setting I can't figure out. There's no problem when I use the audio out/headphone socket, plugging directly into the sound system. I've tried quitting the application and restarting the computer. I'm using Airport Express, with the speaker system plugged into that, for Airplay. Internet isn't connected, but that shouldn't make any difference, should it?