Imagine every Roland Sound Canvas MIDI module in an iPad app for $19.99, works perfectly with all my MIDI controller apps.
http://www.roland.com/products/sound_canvas_for_ios/
Sound Canvas for iOS supports the four different sound maps compatible with the Sound Canvas series, including SC-8820, SC-88Pro, SC-88 and SC-55. Also supported are the GM2 and GM tone maps. The powerful built-in effects include Reverb, Chorus, Delay, 2-Band EQ, and 64 types of insertion effects. Sound Canvas for iOS can also play SMF data for the SC-88Pro, and SC-8820 .
Highly recommended!