Deb, do you ever allow the patients to use your iPad as part of the therapy? There are many music apps for the iOS platform that aren't really like Garageband or BIAB, which I could imagine might be very useful.

Brian Eno has his name associated with a few apps which I think could be useful (Bloom was the first, but there are some newer ones that I can't think of right now). The iPAD touchscreen has a bit of velocity sensitivity with the accelerometer that's in the iPad, and that coupled with the x-y capability offer up some very unique and easy to learn controls of music for the end user. I've used it and as a musician, it gets a little boring, but for someone who has never been able to express themselves with traditional instruments, I can imagine it might do wonders. There are other music apps which take advantage of the accelerometer in other ways and take advantage of the touch surface in other ways. Jordan Rudess is also involved with an app company where there might be usefulness as a therapeutic device.

http://www.generativemusic.com/bloom.html

http://www.wizdommusic.com/products/geo_synthesizer.html