Wavefolder

A multi-stage west-coast wavefolder. It drives a signal hard and folds the peaks back on themselves, generating rich, metallic harmonics from even the plainest waveform. Feed it a sine and it blooms into bright, evolving timbres — the classic Buchla-style alternative to subtractive filtering.

How it works

Instead of removing harmonics like a filter, a wavefolder adds them. The incoming audio is amplified, then any part of the wave that exceeds the limit is reflected back inward — once for each pass you set with Folds — so the harder you push, the more creases appear in the waveform and the brighter and busier the spectrum becomes. A final soft-clip stage keeps the output musical rather than harsh.

Controls

  • Fold — how hard the signal is driven into the folder. Low settings barely touch it; turn it up and each new fold layers in more harmonics, moving from a gentle shimmer to a clangorous, ring-mod-like timbre.
  • Sym — biases the waveform off-center before it folds. At the midpoint the folding is symmetric; moving away introduces asymmetry and even harmonics, giving a hollower, more vocal character.
  • Folds — how many times the wave is reflected back on itself, stepped from 1 to 8 (default 4, the classic voicing). Low counts leave the signal grittier and tanh-saturated, like an overdrive; crank it toward 8 for fully resolved, glassy, brighter folds. The effect is most pronounced when Fold is already driving hard.

Inputs & outputs

  • In L / In R — the audio to fold; sines and triangles give the cleanest, most classic results. Mono? Just use L and it feeds both outputs. Patch a stereo pair and each side folds independently through the shared knobs, so a wide source stays wide.
  • Fold / Sym / Folds CV — voltage control over each knob, summing with the panel setting. Patch an envelope or LFO into Fold CV to make the timbre move, or sweep Sym and Folds for shifting harmonic character.
  • Out L / Out R — the folded, soft-clipped signal. With stereo in but only L cabled, the channels fold to mono automatically so nothing goes missing.

Tips

  • A slow envelope or LFO into Fold CV turns a static tone into a sweeping, harmonically alive one — the wavefolder's signature trick.
  • Folding a pure sine gives the most predictable spectrum; complex or already-bright sources can fold into noise quickly.
  • Nudge Sym off-center for a reedier, hollow tone, then modulate Fold for an expressive, brassy voice.
  • Drop Folds to 1 or 2 with Fold pushed hard for a dirty overdrive; raise it toward 8 for the bright, glassy, fully-folded west-coast tone.