Quicksilver sounds

To switch sound source from the command line:
switchaudio

Use this to make scripts such as:

#!/bin/bash
/Users/adam/humor/SwitchAudioSource -s "Built-in Line Output"
afplay /Users/adam/humor/losinghorn.wav
/Users/adam/humor/SwitchAudioSource -s "Built-in Output"


Then make triggers in Quicksilver by:

1. Go to trigger pane, make new hotkey trigger
   
2. press "." to allow you to type a command
   
3. make sure the action is "Run"
   
4. hook up a hotkey
   
5. if it doesn't work, just try again. Persist through crashes, they happen often.
   

Follow-up: You can also control the volume!
http://discussions.apple.com/thread.jspa?threadID=585781
osascript -e 'set volume output volume 100'