Utility modules for signal routing, mixing, and manipulation.
4-channel audio mixer.
let mixer = patch.add("mixer", Mixer::new());
| Port | Signal | Description |
|---|
in_1 - in_4 | Audio | Audio inputs |
gain_1 - gain_4 | Unipolar CV | Channel gains |
master | Unipolar CV | Master gain |
| Port | Signal | Description |
|---|
out | Audio | Mixed output |
Controls signal amplitude with CV.
let vca = patch.add("vca", Vca::new());
| Port | Signal | Description |
|---|
in | Audio | Audio input |
cv | Unipolar CV | Gain control (0-10V = 0-100%) |
| Port | Signal | Description |
|---|
out | Audio | Amplitude-controlled output |
Linear response:
$$\text{out} = \text{in} \times \frac{\text{cv}}{10}$$
Attenuates, inverts, or amplifies signals.
let atten = patch.add("atten", Attenuverter::new());
| Port | Signal | Description |
|---|
in | Any | Input signal |
amount | Bipolar CV | Scale factor (-2 to +2) |
| Port | Signal | Description |
|---|
out | Any | Scaled output |
| Amount | Effect |
|---|
| -2.0 | Inverted and doubled |
| -1.0 | Inverted |
| 0.0 | Silent |
| 0.5 | Half level |
| 1.0 | Unity (unchanged) |
| 2.0 | Doubled |
Adds DC offset (constant voltage source).
let offset = patch.add("offset", Offset::new(5.0)); // 5V
| Port | Signal | Description |
|---|
out | CV | Constant voltage |
// Center LFO modulation
patch.connect(offset.out("out"), vcf.in_("cutoff"))?; // Base cutoff
patch.connect(lfo.out("sin"), vcf.in_("fm"))?; // Modulation
Signal splitter (1 input to 4 outputs).
let mult = patch.add("mult", Multiple::new());
| Port | Signal | Description |
|---|
in | Any | Input signal |
| Port | Signal | Description |
|---|
out_1 - out_4 | Any | Identical copies |
Single-sample delay (z⁻¹).
let delay = patch.add("delay", UnitDelay::new());
| Port | Signal | Description |
|---|
in | Any | Input |
out | Any | Delayed by 1 sample |
Essential for feedback loops.
Crossfade between two signals with equal-power curve.
let xfade = patch.add("xfade", Crossfader::new());
| Port | Signal | Description |
|---|
a | Audio | First signal |
b | Audio | Second signal |
mix | Unipolar CV | Crossfade position |
pan | Bipolar CV | Stereo position |
| Port | Signal | Description |
|---|
left | Audio | Left output |
right | Audio | Right output |
$$\text{gain}_A = \cos\left(\frac{\pi}{2} \cdot \text{mix}\right)$$
$$\text{gain}_B = \sin\left(\frac{\pi}{2} \cdot \text{mix}\right)$$
High-precision CV addition for V/Oct signals.
let adder = patch.add("adder", PrecisionAdder::new());
| Port | Signal | Description |
|---|
a | V/Oct | First pitch |
b | V/Oct | Second pitch (offset) |
| Port | Signal | Description |
|---|
out | V/Oct | Sum of pitches |
Use for transpose, octave shifts, and pitch offsets.
Final stereo output stage.
let output = patch.add("output", StereoOutput::new());
patch.set_output(output.id());
| Port | Signal | Description |
|---|
left | Audio | Left channel |
right | Audio | Right channel (normalled to left) |
If only left is patched, right mirrors it (mono).
Injects external CV/audio into the patch.
use std::sync::Arc;
let cv = Arc::new(AtomicF64::new(0.0));
let input = patch.add("pitch", ExternalInput::voct(Arc::clone(&cv)));
| Method | Signal Type |
|---|
::voct() | V/Oct pitch |
::gate() | Gate signal |
::trigger() | Trigger |
::cv() | Unipolar CV |
::cv_bipolar() | Bipolar CV |
| Port | Signal | Description |
|---|
out | Varies | External value |
// LFO → Attenuverter → Offset → Target
// Allows precise control of modulation depth and center
patch.connect(lfo.out("sin"), atten.in_("in"))?;
patch.connect(atten.out("out"), adder.in_("a"))?;
patch.connect(offset.out("out"), adder.in_("b"))?;
patch.connect(adder.out("out"), vcf.in_("cutoff"))?;
// Split signal to dry and wet paths
patch.connect(input, mult.in_("in"))?;
patch.connect(mult.out("out_1"), dry_path)?;
patch.connect(mult.out("out_2"), wet_path)?;
patch.connect(dry_path, xfade.in_("a"))?;
patch.connect(wet_path, xfade.in_("b"))?;