C15 Digital Keyboard Synthesizer

Born from the mind behind the legendary Phase 22 software, this synth starts with just two digital sine waves but unlocks a universe of tones through clever phase modulation and feedback wizardry.

Its Phase 22 engine drives 20 polyphonic voices via dual oscillators per branch—Branch A and B—each with shapers, phase modulation mimicking DX7 FM, wavefolding, fluctuation for noise-like textures, ring mod, and sub-audio rates for unconventional modulation. A state variable filter and comb filter run in parallel, fed by a feedback mixer that loops effects like reverb, echo, flanger, cabinet, and gap filter back into the chain for organic complexity. Three ADBDSR envelopes (attack, decay, break, decay2, sustain, release) shape everything with velocity and key-tracking sensitivity, while a deep mod matrix lets four macro knobs target any of 86 parameters, all continuously variable with no switches—just seamless morphing, even between presets over set times. The 61-key semi-weighted Fatar action feels premium, paired with a dedicated pitch bender, dual 800mm ribbon controllers lit by 33 LEDs each, aftertouch, and four pedal inputs for live expression. Built as a separable base unit (keyboard and audio) plus detachable panel with 96 haptic buttons, OLED screens, and magnetic overlays, it measures 35.4 x 16.1 x 6.2 inches, offers stereo outs, headphones, WiFi, unlimited undo tree, and endless tagged presets.

Players love how it plays like an acoustic instrument—responsive and intuitive for stage use—delivering everything from electric piano to bubbling soundscapes without menus or sequencers. Some note the learning curve for its parameter depth, but once dialed in, the continuous controls and real-time tweaks keep it addictive for performers chasing unique, evolving sounds.