there’s 2 FM Synth apps all with 4 OP FM (not like the DX7’s 6OPs) but here’s another one upcoming FM app the FM4 by Primal Audio.
- unisono fatness
- 8 voices on iPad 2
-3 sound engines – retro sound emulation so this may sound more authentic than DXi (which is a no brainer as well) and another one which is quite expensive..
will cost 99cent (introductory price)