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).
Parametric EQ
A six-band stereo EQ for detailed tone shaping, with an interactive response curve and a live analyser behind it. Drag a band's handle right on the display to set its frequency and gain, or dial everything in from the sliders. Each band can be a Bell, a shelf, a cut filter or a Notch, and the six bands start out flat, ready to grab.
Every band has the same five controls. By default the bands sit at 80, 200, 600, 1,500, 4,000 and 10,000 Hz: a Low Shelf at the bottom, four Bells in the middle and a High Shelf at the top, all at 0 dB.
| Parameter | Range | Default | Description |
|---|---|---|---|
| On (per band) | Off / On | On | Switches the band in or out. |
| Type (per band) | Bell, Low Shelf, High Shelf, High Pass, Low Pass, Notch | Shelves at the ends, Bells in the middle | The band's shape. |
| Freq (per band) | 20 to 20,000 Hz | 80 to 10,000 Hz across the bands | Centre or corner frequency of the band. |
| Gain (per band) | -24 to +24 dB | 0 dB | Boost or cut. Used by the Bell and shelf types. |
| Q (per band) | 0.10 to 20.0 | 0.707 | Width of the band. Higher values are narrower and sharper. |
Inputs: In L, In R (audio); for every band: On and Type (Data values), plus Freq, Gain and Q (each a Data/CV pin, so any band can be swept live at full speed); Appearance (Data, a JSON object that restyles the body).
Outputs: Out L, Out R (audio); every band also echoes its On, Type, Freq, Gain and Q as data outputs 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 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. The node draws the three bands on a frequency graph, and you set the two split points by dragging them right on it. A Slope control sets how steep the split is. Each band is kept cleanly separated (the High band rejects the lows instead of leaking them through), and the three add back together into the full signal, so you can treat each band on its own and then recombine them. The node is resizable and can sit on the front panel, with its own appearance settings.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Low X (Hz) | 20 to 20,000 Hz | 200 Hz | Frequency where the Low and Mid bands split. Drag the left point on the graph or set it here. |
| High X (Hz) | 20 to 20,000 Hz | 4,000 Hz | Frequency where the Mid and High bands split. Drag the right point on the graph or set it here. |
| Slope | 12 / 24 / 36 / 48 dB per octave | 24 dB per octave | How steep the split between bands is. |
Inputs: In (mono audio); Low X, High X, Slope (each a Data/CV pin), plus an Appearance pin.
Outputs: Low (everything below Low X), Mid (between Low X and High X), High (everything above High X), all audio; plus Low X and High X, which emit the current split frequencies as you drag them.
Crossover Stereo
The same three-band splitter for a stereo pair: In L and In R are split into Low, Mid and High left/right pairs (six audio outputs), with the same Low X, High X and Slope controls and the same drag-to-set graph.
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).