We have not yet tested this out, but instructions for adding Soundfonts to Apple GarageBand are contained in the rest of this story (Click "Read More"). Cool indeed!
- Place the sound bank file (SF2 or DLS) in one of these two places: ~/Library/Audio/Sounds/Banks/ (for current user only) or /Library/Audio/Sounds/Banks/ (for all users)
- Launch GarageBand and either add a software instrument track, or double-click an existing one. At the bottom of the track settings window that appears, select DLSMusicDevice from the Generator popup menu.
- Click the rightmost button that is in the same row as the Generator popup. A dialog appears where you can select your DLS or SF2 sound bank file.
- By default, it loads the first instrument in the bank. If you want to change to other instruments, you must do so via MIDI. Simply send a program change event to select other instruments in the sound bank. (e.g. changing sounds on your MIDI keyboard controller is often sufficient)
- Play music!