FI-P01Eurorack voice16 HP

One oscillator, a wavefolder, a resonant filter, a VCA and an LFO, in sixteen HP. Digital where it helps. Analog where it shows.

1. **Turn**Drag a knob up or down. Arrow keys work too.
2. **Patch**Pull a plug and drop it in another jack. Outputs feed inputs.
3. **Hear**Silent until you press .

Reading

- **Pitch**
  A2 110.0 Hz
- **Shape**
  Tri, 2% to saw
- **Fold**
  3.5×
- **Cutoff**
  1.49 kHz
- **Res**
  +5 dB
- **LFO**
  0.55 Hz

Patched

- LFO to FOLD
- SQR to V/OCT

# PATCH-01

> PATCH-01 is a 16 HP Eurorack voice: morphing oscillator, wavefolder, resonant filter, VCA and LFO. This page is the module. Turn it, patch it, hear it.

02Assembly

## Six layers. Nothing loose.

Everything you touch is bolted to the panel, so nothing flexes when you patch in the dark. Taken apart, it still makes sense.

1. 1 Screws 4×M3 button head, black oxide.
2. 2 Knobs 6×Turned aluminium, diamond knurl, orange index.
3. 3 Hardware 14×Hex nuts and washers. Torqued, not glued.
4. 4 Panel 1×2 mm 5052 aluminium, brushed, laser-engraved.
5. 5 Control board 1×Pots, jacks, LEDs and the 1.8-inch scope.
6. 6 Main board 1×96 kHz DSP, analog filter and VCA, keyed power.

03Signal

## Follow the signal.

The scope is the module’s own screen. Scrolling moves the probe from stage to stage. With power on, you hear what you see.

1. 01OSC A morphing core. SHAPE sweeps sine, triangle, saw and square. Tracks 1 V/oct over seven octaves.
2. 02FOLD Below noon it warms. Past noon the wave folds back on itself and grows harmonics you did not ask for.
3. 03FILTER Two-pole low-pass, analog, resonant. It files the edges off whatever the folder made.
4. 04VCA Normalled open. Patch a CV into it and the level follows. The LFO makes it breathe.
5. 05LFO 0.05 to 20 Hz, triangle and square. It drives the LEDs too, so you can read the tempo from across the room.

- **Probe**
  OSC
- **Time**
  2.0 ms/div
- **CV in**
  None

## Every patch has a shape.

Plot the output against itself a fifth of a cycle later, and again, and the sound draws its own figure in three dimensions. This one is the patch you made at the top of the page.

04Specification

## Measured, not rounded.

Every figure below comes from the same drawing the panel is cut from.

Front and side elevations, millimetres. Depth includes the power header.

| Format | Eurorack, 3U |
| --- | --- |
| Width | 16 HP / 80.9 mm |
| Depth | 32 mm including power header |
| Power | +12 V 92 mA / −12 V 38 mA / +5 V unused |
| Inputs | V/OCT, FOLD, CUT, VCA / ±5 V |
| Outputs | OSC, OUT, LFO, SQR / 10 Vpp |
| Controls | 2 × 17 mm and 4 × 10.5 mm knobs |
| Oscillator | Sine to square morph / 27.5 Hz to 3.52 kHz |
| Wavefolder | 1 to 8 folds, sine law |
| Filter | 2-pole low-pass, 12 dB/oct, resonant |
| LFO | 0.05 to 20 Hz, triangle and square |
| Display | 1.8-inch, scope and tuner |
| Panel | 2 mm aluminium 5052-H32, brushed or black anodised |
| Weight | 118 g |

05Order

## Pick a finish. We do the rest.

Raw Brushed aluminium, graphite legends Carbon Black anodised, bright-cut legends

$349 First batch ships February 2027. Full refund until it does.

In the box: the module, a 10-to-16 pin power ribbon, four M3 screws, and the two cables from the top of this page.

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The page this is the Markdown version of: https://patch-01.laarpi.com/