From my Matrix6R comments:

The Matrix 6 and 6R are undoubtedly the most underated and most powerful analog synth of its class. The sound and synthesis engine blows away its competition - any of the Junos, JXs, Sixtrak, Multi-trak, AX60, DW8000, etc.. On top of what you would expect from a classic analog, this synth has a matix modulation consisting of 20 sources and 32 destinations, a 5 point track generator that allows you to take a modulation source and have it effect a destination diffently in time for a total of 1,073,744,824 ways (that is not a typo), and two ramp generators that act like the attack portion of an envelope, only you can assign them to any of 32 destinations. You can also assign multiple sources to multiple destinations. Aside form velocity and pressure sensitivity that is fully programable to affect 32 destinations, this synth also has fully programable release velocity (how quickly you release the keys can be set to affect the sound). An example of putting all of these extra features to use would be to have LFO 1(set to 0) to modulate DCO1 frequency, set a ramp generator to increase LFO freq in time, have pressure sensitivy increase the VCF, velocity effect the VCA, and have the release velocity affect release time. Think of how dynamic playing this sound would be. Try this on the competition. The sound on this synth is not only increadible and warm, but also dynamic beyond all my other synths. The only thing missing from this synth, and big unfortunate thing it is, is real time control. It's too bad this synth came out alongside the tiny DX7 and other digital synths that started the removal of real time control. Despite that, this is still my favorite synth.