Tap Tempo front panel
Video Demo Buy ModularGrid VCV Rack DIY Assembly Source Code Download .hex

In-browser flashing works in Chrome or Edge. ⚠️ Disconnect Eurorack power before connecting USB.

Connect the Nano over USB, click Flash, and choose its serial port.

Maddie MOD1

Tap Tempo

Clock

A four-output tap-tempo master clock with multiplied and divided outputs.

Width
4 HP
Depth
28 mm
Power
+12V
MCU
Arduino Nano
Controls
3 pots · button · LED
I/O
4× 0–5V jacks

Overview

A tap-tempo master clock with four outputs: a fixed 4× output, a variable 1–16× multiplier, and two variable 1–1/16 divider outputs. Tap the button four times to set the tempo and the whole rack falls into step.

Panel & I/O

Control Pin Function
POT1 A0 Mult — F2 multiplier rate
POT2 A1 Div — F3 division rate
POT3 A2 Div — F4 division rate
BTN D4 Tap tempo (tap 4×)
LED D3 1× output
F1 D17 Out — 4× clock
F2 D9 Out — 1–16× variable
F3 D10 Out — 1–1/16 variable
F4 D11 Out — 1–1/16 variable

Features

  • Set tempo by ear with a four-tap input
  • One fixed and three variable clock outputs
  • Independent multiplier and two dividers
  • A compact master clock for the whole patch

© 2026 Maddie Synths · firmware based on work by Hagiwo · original firmware CC0 1.0 · hardware design by Hagiwo