There are different software & hardware solutions for using switches to make music. E-Scape is more complex then a stand-alone hardware solution, so you need to invest time to learn the program .......... but in return you'll get a lot
Have a look on:
http://mybreathmymusic.googlepages.com/e-scape
to see how I use the software with Zehra and Eshra. two sisters with a very progressive muscular disease. It's no longer possible to use the wind controllers, they have just not enough breath left.
Ruud
