Does anyone know if you can use the included guitar amps with Software Instruments? I'd love to be able to get those sounds just with a keyboard. It should be possible - from what I can tell, Software Instruments use actual sound files for each note (as opposed to the QT midi synthesizer which just pitches the same sound up or down...this is very important as instruments tend to have different tonal qualities depending on the pitch of the notes, which the synth competely forsakes but garageband apparently takes into account. which rocks!). It'd be great to apply the amps to the guitar software instrument (which sounds amazing in the keynote). So: can the amps be used on SW instruments or not?