In addition to the bugs I noticed, I have some feature requests now..
-> An overdrive / distortion effect would be really cool, as there aren't really any ways to get that sort of crunch without relying solely on filter resonance.
-> Perhaps a multi template for people who want to stack two or more patches together in a layer? The current multi template seems to use just four voices and everything is the same group / zone.
Honestly this is all I can think of without getting carried away and getting too far away from the original Matrix concept. It's a near-perfect synth!