[www.macosxapps.com]

Detour is an audio router allowing the selection of audio output device and relative volume for individual applications.

Detour allows you to send audio to different output devices on an application-specific basis, which means you can…

…send music from iTunes to your external speakers and keep the annoying beeps and blips of iChat going through your computer’s built-in speaker.

…mute any application’s sounds all together.

…change the volume of some applications relative to others. Make your email client’s alerts quieter, and you’ll never again be jarred from work just to receive spam.