A little story about the famous Synclavier. Btw, the best desktop emulation might be the one from Arturia and there’s one on iOS, too.
An in depth tutorial on how to import loops & MIDI into iPads from Mobile Music Pro.
Get lots of free samples/patchs for iOS apps or as Wav files from Electronicsounds (Donations possible).
Here´s a free TouchOSC template to control Ableton Live´s Analog synth. It uses MIDI channels 12 and 13 (editable of course).
Caustic 3 is a music creation tool inspired by rack-mount synthesizers / samplers rigs. Everything is real-time and optimized for mobile devices.
But the desktop version is free (No support)
Click pic to get to Skram @ Itunes Store.