Opsix MkII FM Keyboard Synthesizer

Imagine twisting the knobs on a synth that lets you sculpt FM tones as intuitively as dialing in a classic analog patch— that's the magic of Altered FM, where operators morph into ring mods, wave folders, or even effects beyond traditional sine-wave synthesis.

At its core, this keyboard packs six operators with direct hands-on control via an illuminated mixer, letting you tweak ratios, levels, and modes like FM, ring mod, filter FM, or wave folding right from the panel. A velocity- and release-sensitive 37-key keyboard anchors a compact 22.24" x 13.31" x 3.54" frame weighing just under 7 lbs, with 64-voice polyphony for lush chords, 11 analog-modeled filters including MS-20 and Polysix emulations, three EGs, three LFOs, and a 12-slot mod matrix. Step sequencer up to 16 steps with motion lanes, arpeggiator, spectrum analyzer, oscilloscope, randomizer, and 30 stereo effects from shimmer reverb to decimator round out the toolkit, all stored in 500 programs.

Players love how it demystifies FM for newcomers while rewarding deep dives—those operator lights make visual sense of complex routing, and the doubled polyphony opens up huge pads without voice stealing. Sure, the menu diving for user algorithms takes practice, but the sounds pull you right back in.