Kawai K5000

Back in 1996, this synth arrived as Kawai's bold leap into advanced additive synthesis, letting you sculpt sounds from up to 128 harmonics per oscillator—think 512 envelope parameters alone for oscillator-level control, a depth that rivaled anything on the market.

It layers up to six sources blending digital additive engines with PCM waves, each packing 64 harmonics, a dedicated formant filter, and tools like odd/even harmonic tweaks for instant sawtooth waves or resynthesis vibes. A 61-key velocity-sensitive keyboard with polyphonic aftertouch pairs with realtime knobs, a large LCD, and deep mod matrix tying LFOs, envelopes, and key position to nearly everything. Dual 24dB resonant filters (lowpass, highpass, plus that wild 128-band formant) plus 32 effects deliver airy, morphing tones, all in a sleek 14kg chassis with full MIDI and a 40-pattern arpeggiator.

Players still geek out over its powerful, otherworldly sounds—Kraftwerk favored it—and the hands-on workflow shines once you dive in, though the additive steepness tripped up some who stuck to PCM romping.