I see my review was not helpful, so I'll try to revise it with some additional knowledge and assistance. This is not intended to be the manual. In fact it has a manual, so please read that.
This synth has a very unique sound akin to FM. It uses Phase Distortion Synthesis: http://en.wikipedia.org/wiki/Phase_distortion_synthesis.
How the envelopes work:
After a lot of experimentation, I have found that this synth excels at filling the high end of the frequency spectrum, in a way that few other synths can. It is great for glitchy electronic sounds and retro FM type pads and electric pianos, and yes... you can do dubstep growl basses with it. You can get a lot of the sounds you would expect out of a 2 operator FM synth, but with the ring mod algorithms you can get a lot more out of it.
It's not the easiest to learn or use, but it's worth your time.Read Review