CB Harmonograph

v1.1 · RATIO ENGINE
Out Clock in
Source
84.0
Clk out
Base cycles/bar
Tuning Bend range
Four pendulums, two swinging horizontally and two vertically, trace a figure together. Each pendulum's frequency ratio does two jobs at once: it sets how often that pendulum fires, and it sets the interval it plays. A 3:2 pendulum triggers three times for every two of the base and sounds a perfect fifth.

Just sends per-channel pitch bend so the ratios are exactly in tune. Turn it off to hear how far equal temperament sits from them.

For drones: Base cycles/bar takes fractions — .25 is one swing every four bars, .125 every eight — and Gate runs to 2000%, so the strokes overlap into a chord that turns over rather than a pulse. Set Decay to 0 and Auto-strike to off so nothing resets. Swell sends each pendulum's own swing as a CC on its own channel (11 = Expression by default), which bows the synth through the stroke instead of hitting the front of it. Drift now wanders as well as detunes, so the phasing never settles.

space play · S re-strike · C clear trail

Musical

Root Gate %
CC X CC Y Ch
Swell each pendulum's CC follows its own swing

Decay & trail

Decay22
Auto-strike8
Trail72
Drift0
Kick0
real pendulums are never exact
Preset

Harmonograph

Coupled pendulums drawing figures, where each frequency ratio is both a rhythm and a musical interval.
Needs Web MIDI over HTTPS or localhost.