wavetable vco

wavetableVco · sources · schema v3

Wavetable oscillator that morphs saw -> square -> triangle -> sine across a 16-frame table.

A single-cycle wavetable oscillator. Instead of one fixed shape, it reads from a built-in 16-frame table that morphs continuously saw → square → triangle → sine, and the WAVE control scans across those frames so you can sweep the timbre in real time (or modulate the scan with CV for a moving, evolving tone). Pitch is 1V/oct (0V = C4) trimmed by TUNE (coarse semitones) and FINE (cents). On top of the basic oscillator it has two audio-rate modulation inputs that make it sound complex or metallic: an FM input (frequency modulation, scaled by the FM AMT control) and a PM input (phase modulation, scaled by PM AMT). The table is the fixed shape set shipped with the module — there is no per-frame selector or upload here (use WAVECEL or WAVVIZ for custom wavetables); WAVE only scans the table that's already loaded.

the faceplate

8 inputs · 1 outputs · 5 params

about this module

Hover a control, or open the patch panel and hover a jack.

inputs

id	cable	what it does
`pitch`	pitch	1V/oct pitch input — 0V plays C4 and each ±1 shifts the oscillator a full octave. Sums with the TUNE and FINE controls (and the TUNE/FINE CV inputs) to set the playback frequency, which is clamped to roughly 1 Hz–20 kHz. V/oct pitch CV
`fm`	audio	Audio-rate frequency-modulation input, depth set by the FM AMT control (FM AMT 0 = no effect). Modulation is EXPONENTIAL, not linear/through-zero: the incoming signal is added in the semitone domain (±1 in × FM AMT = up to ±12 semitones of pitch wobble), so a positive input raises pitch and a negative input lowers it, but the frequency is floored at 1 Hz and never crosses to the other side of zero. A negative FM AMT flips the modulator's polarity. audio signal
`wavePos`	cv	CV that scans the wavetable, summing with the WAVE control to pick the morph frame (saw → square → triangle → sine). Audio-rate and clamped to 0..1, so an LFO or envelope here continuously sweeps the timbre; full-scale ±1 covers the whole table from the WAVE setting. control voltage (CV); modulates wavePos (summed directly (the destination DSP scales it))
`pm`	audio	Audio-rate phase-modulation input, depth set by the PM AMT control (PM AMT 0 = no effect). It offsets where the oscillator reads into the wavetable without changing the underlying frequency: ±1 in × PM AMT = ±1 up to a full cycle of phase shift, which adds harmonics for FM/DX-style metallic and bell-like tones. A negative PM AMT inverts the direction of the offset. audio signal
`tune`	cv	CV that displaces the TUNE control, shifting coarse pitch in semitones (its full natural range of about ±36 semitones, centered on the knob). control voltage (CV); modulates tune (additive offset — ±1 CV sweeps the full range, centered on the knob)
`fine`	cv	CV that displaces the FINE control, shifting pitch in cents (its full natural range of about ±100 cents, centered on the knob) for detuning. control voltage (CV); modulates fine (additive offset — ±1 CV sweeps the full range, centered on the knob)
`fmAmount`	cv	CV that displaces the FM AMT control, modulating how deep the FM input drives the pitch. control voltage (CV); modulates fmAmount (additive offset — ±1 CV sweeps the full range, centered on the knob)
`pmAmount`	cv	CV that displaces the PM AMT control, modulating how deep the PM input shifts the readout phase. control voltage (CV); modulates pmAmount (additive offset — ±1 CV sweeps the full range, centered on the knob)

outputs

id	cable	what it does
`audio`	audio	The oscillator's audio output — the interpolated wavetable signal at the current pitch and WAVE position, including any FM and PM applied. Mono, roughly ±1 in level; patch it into a filter, VCA, or mixer. audio signal

params

id	label	range	curve
`tune`	Tune	-36..36st	linear
`fine`	Fine	-100..100¢	linear
`wavePos`	Wave	0..1	linear
`fmAmount`	FM	-1..1	linear
`pmAmount`	PM	-1..1	linear

controls

control	what it does
Fine	Fine tuning in cents, ±100 (±1 semitone), for detuning or beating against another oscillator. 0 is no offset.
FM	Depth of the FM input: how strongly the audio-rate signal at the FM input modulates pitch (up to ±12 semitones at full input). 0 ignores the FM input; negative values invert the modulator's polarity.
PM	Depth of the PM input: how strongly the audio-rate signal at the PM input offsets the wavetable readout phase (up to a full cycle at full input). 0 ignores the PM input; negative values invert the direction of the phase offset.
Tune	Coarse tuning in semitones, ±36 (±3 octaves), added to the 1V/oct pitch input. 0 leaves the incoming pitch untouched.
Wave	Scans the position into the 16-frame table from 0 (the first frame) to 1 (the last), morphing the timbre saw → square → triangle → sine; the WAVE POSITION CV input sums on top of this. Sets where in the table the oscillator reads — the table itself is fixed.

source

wavetable-vco.ts on GitHub.