AIR Music Technology OPx-4 v1.1.0

OPx-4 gives you deep, compelling FM synthesis that is easy to dial in
Four operator FM synth engine with wave looping, sample offset, and multiple filters
Make deep, evolving sounds with a strong attack, morphing, or filter movement
Create digital tones like classic EPs, 80s FM synth sounds, or strange FM sound effects
Built-in effects with compression, EQ, delay, reverb, lo-fi effects, and more
Eight assignable macro knobs for easy-to-control FM synth effects
A 32-slot FM modulation matrix for the ultimate in sound design potential
Multiple preset banks give you easy access to great FM sounds