This will be my first KVR review, and it's for the most useful synth I've DL-ed in quite awhile, the NitreousPM. The thing to remember is that if you turn on the retrigger on the mod envelope, click the "v" over the Envelope knob on the filter and then turn Hard Sync about halfway up, some cool FM sounds can be had. The filter needs to be LP 24db and A, D, & R on the mod envelope need to be at zero with S close to zero. Another great group of sounds are the mono chordal leads, with the Hard Sync knob tuning the overtone. I was also impressed with the basses I was able to make. Hard basses, soft basses, resonant, overdriven, "plop" sounds. The list goes on. It's easy to do moogy-sounding leads on this synth too. For these, turn off Retrigger and leave Hard Sync off. The only thing I don't like is the Unison, since it introduces pops and crackles into the sound. Can't have everything.
So that's my review, essentially a little tour around the NitreousPM. I was captivated by the synth for over a month and made way more patches than eventually went into the 64-preset bank I uploaded here. If you like mono basses and leads of all kinds then NitreousPM is your girl.