I'm saying that they probably use a general midi sound bank, with sample sounds and limited control. You can only choose instruments from a predefined palette.

I'm saying that they probably use a general midi sound bank, with sample sounds and limited control. You can only choose instruments from a predefined palette. I doubt you could generate your own waveforms, apply your own custom effects and so on. I never researched much into MIDI ringtones so I might be wrong.