Bass Synthesizer

Back in 1977, German organ pioneers Wersi dropped this quirky little Baß Synthesizer—also known as the AP-6—that bridged the gap between church organ vibes and raw analog bass tones, complete with that funky German ß on the panel for extra character.

It's a monophonic analog beast with a single master oscillator feeding into organ-style stops: five sine-wave flutes from thunderous 16' to piercing 1', paired with sawtooth brass at 16' and 8', plus a square-wave woodwind at 8'—all mixable via independent volume knobs. The star is its realistic Bass Guitar mode, tweaked with an "On" attack control for picked or fingered feels, and a "Damp" sustain for muted punch. Effects shine through octave glide in up/down manual or auto modes, a wild "Hawaii" pitch bend down, and a formant "Wah-Wah" filter on brass and woodwind with rotor auto-sweep, direction switches, and a simple attack/sustain envelope. Housed in a compact, upright metal cabinet with velocity-sensitive keyboard, fine-tune, and master pitch controls, it's a kit-build option too, keeping things hands-on.

Vintage hunters love its warm, authentic electric bass growl that cuts through mixes, though some note the organ-esque interface takes getting used to for pure synth heads—still, its rarity and fat low-end keep it a cult favorite.