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Maddie MOD2
FM Drum
Drums · FM
A two-operator FM percussion voice — six parameters across two modes with smooth pickup switching.
- Width
- 4 HP
- Depth
- 28 mm
- Power
- +12V / −12V / +5V
- MCU
- Seeed XIAO RP2350
- Controls
- 3 pots · button · LED
- I/O
- 2 gate in · 1 CV in · PWM audio out
Overview
A two-operator FM percussion voice. The three pots double up across two modes for six parameters total — pitch, operator ratio, modulation index, decay, and ratio envelope. A “pickup” feature means parameters don’t jump when you switch modes, and all six are saved to flash. An accent input cuts the level by 6 dB.
Panel & I/O
| Control | Pin | Mode 0 | Mode 1 |
|---|---|---|---|
| POT1 | A0 | Pitch | Decay time |
| POT2 | A1 | Operator ratio | Ratio envelope |
| POT3 / CV | A2 | Modulation index | Modulation index |
| IN1 | GPIO7 | In — Trigger | |
| IN2 | GPIO0 | In — Accent (−6 dB) | |
| BUTTON | GPIO6 | Mode toggle & save | |
| OUT | GPIO1 | Out — 10-bit PWM audio | |
| LED | GPIO5 | Mode indicator |
Features
- Two-operator FM synthesis, wavetable-based
- Six parameters via two pot modes
- Pickup feature for jump-free mode switching
- Parameters stored in onboard flash
- Click-free cosine fade in/out
© 2026 Maddie Synths · firmware based on work by Hagiwo · original firmware CC0 1.0 · hardware design by Hagiwo