Appearance
Filters
Filter nodes shape the tone of your sound by turning certain frequencies up or down: sweeping a cutoff, ringing out resonant peaks, splitting a signal into separate frequency bands, shifting phase, or giving a source a vocal-like colour. Most of their controls accept both a simple value and a live, audio-rate signal (CV), so a knob can be moved automatically by another node while the sound plays. Several of these nodes also have an interactive display you can add to the front panel as a control.
Filter
A stereo filter with several modes: the classic shapes plus warmer, resonant ladder types, with an interactive response curve and a live analyser sitting behind it. Drag the curve to set the cutoff and resonance, or drive the controls from an envelope or LFO.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Mode | Choice | LP | Filter shape. One of LP, BP, HP, Peak, Notch, Low Shelf, Hi Shelf, or the ladder variants below. |
| Freq | 20 to 20,000 Hz | 1,000 Hz | Cutoff or centre frequency. Sweeps where the filter acts on the spectrum. |
| Res/Q | 0.10 to 20.0 | 0.707 | Resonance for ladder modes, Q for biquad modes. Higher values emphasise the cutoff, building self-oscillating peaks. |
| Gain | -24 to +24 dB | 0 dB | Boost or cut around Freq. Only affects Peak, Low Shelf, and Hi Shelf modes. |
| Drive | 1.0 to 20.0 | 1.0 | Saturation pushed into the filter. Only used by the ladder modes, for analog-style warmth. |
Modes: LP, BP, HP, Peak, Notch, Low Shelf, Hi Shelf, Ladder LP12, Ladder LP24, Ladder BP12, Ladder BP24, Ladder HP12, Ladder HP24.
Inputs: In L, In R (audio); Mode (Data value only, no audio-rate CV); Freq, Res/Q, Gain, Drive (each a Data/CV pin); Appearance (Data, a JSON object that restyles the body).
Outputs: Out L, Out R (audio); Freq Out, Res/Q Out, Gain Out (Data, echoing the current values for chaining).
Resonator
A stereo set of four tuned resonators. Each one rings at its own pitch, and a shared Attack and Decay control how the sound enters and how long the ringing lasts. Use it for metallic tones, pitched ambient textures, or to add body and resonance to drums and other percussive sounds.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Attack | 0.1 to 500 ms | 10 ms | How quickly the input excites the resonators. |
| Decay | 10 to 5,000 ms | 850 ms | How long each band rings out. |
| Mix | 0.0 to 1.0 | 1.0 | Blend between the dry input and the resonated signal. |
| Freq 1 | 20 to 18,000 Hz | 180 Hz | Tuning of band 1. |
| Freq 2 | 20 to 18,000 Hz | 420 Hz | Tuning of band 2. |
| Freq 3 | 20 to 18,000 Hz | 1,100 Hz | Tuning of band 3. |
| Freq 4 | 20 to 18,000 Hz | 2,800 Hz | Tuning of band 4. |
| Gain 1-4 | 0.0 to 2.0 | 1.0 | Level of each band in the mix. |
Inputs: In L, In R (audio); a Data/CV input pin for every parameter above (Attack, Decay, Mix, Freq 1-4, Gain 1-4); Appearance (Data, a JSON object that restyles the body).
Outputs: Out L, Out R (audio).
Crossover
Splits one mono input into three frequency bands: Low, Mid, and High. You set the two split points independently, and the three outputs add back together cleanly into the original signal, so you can treat each band on its own and then recombine them.
| Parameter | Range | Default | Description |
|---|---|---|---|
| High X (Hz) | 20 to 20,000 Hz | 4,000 Hz | Frequency where the Mid and High bands split. |
| Low X (Hz) | 20 to 20,000 Hz | 200 Hz | Frequency where the Low and Mid bands split. |
Inputs: In (mono audio); Low X, High X (each a Data/CV pin for the crossover frequencies).
Outputs: Low (everything below Low X), Mid (between Low X and High X), High (everything above High X), all audio.
AllPass Filter
A mono all-pass filter. It shifts the phase (timing) of the signal without making it louder or quieter overall. Use it to build phasers, comb-filtered reverbs, or to gently smear the attack of a sound. Delay sets where the phase shift is strongest, and Gain controls how strong that shift is.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Delay | 0.01 to 200 ms | 20 ms | Length of the internal delay line. Sets the frequency where the phase shifts most. Modulate it with an LFO to build phasers. |
| Gain | -0.999 to 0.999 | 0.5 | All-pass coefficient. Larger absolute values give a more pronounced phase shift; the sign inverts the polarity. |
| Mix | 0.0 to 1.0 | 1.0 | Blend between the dry input and the all-pass output, from subtle phase rotation up to comb-like colouration. |
Inputs: In (mono audio); Delay, Gain, Mix (each a Data/CV pin).
Outputs: Out (mono audio).
Formant Filter
Passes your audio through moving vocal shapes (formants), giving any source a synthetic, talking-like quality. Vowel sweeps between different vowel sounds, while Tone, Breath, and Resonance shape the character of the voice.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Vowel | 0.0 to 1.0 | 0.1 | Sweeps between vowel shapes, moving the formant frequencies. |
| Tone | 0.0 to 1.0 | 0.55 | Brightens the voice and emphasises the upper formants. |
| Breath | 0.0 to 1.0 | 0.15 | Adds airy, breathy noise to the formant. |
| Resonance | 0.0 to 1.0 | 0.7 | Sharpness of the formant peaks. Higher values give a more vocal, pronounced character. |
| Mix | 0.0 to 1.0 | 1.0 | Blend between the dry input and the formant-filtered signal. |
Inputs: Audio In (audio); Vowel, Tone, Breath, Resonance, Mix (each a Data/CV pin); Appearance (Data, a JSON object that restyles the body).
Outputs: Out (audio).