ADDsynth has some terrific multi-operator modulation capability that is burried under the non-readable GUI. It's only slightly easier then programming the original Yamaha DX7 ;)
A nice Modulation Matrix that would allow viewing, setting up and altering the modulation amounts between different voices could greaty popularize the use of this feature and make it much easier to perfrom.
yes, absolutely!! with the waveshaping and envelopes and everything else, a routing matrix could make this blow oxe fm synth and possibly even proprietary synths like fm8 out of the water!!
of course, all this is possible already, but a matrix would make things so much easier