In this video straight from AES, SONiVOX's Jason Jordan gives us a look at the things you can do in MUSE. Aside from having access to 40GB worth of 1,500 virtual instruments ranging from synths to bagpipes and everything in between, you can stack instruments on one channel with MIDI.

Here, Jason demonstrates stacking with a grand piano and a violin. One tip: stack the violin on top of the grand piano or you'll end up with a broken violin. You can probably even stack a drum sting into that last sentence.