Offer Details
Selling a beautifully built and fully calibrated x0x‑Heart eurorack module with the EI‑303 interface by
jean.pri, with few tweaks — a complete, performance‑ready TB‑303 voice in Eurorack format.

EI‑303 adds:
- 303‑style control panel
- controls and CV for Saw/Square mix,
- Drive, Filter FM controls
- Invertible Accent/Slide knobs with led illumination,
and more intuitive, ergonomic layout for live tweaking.
- calibration controls - easily accessible.
Condition: fully working, clean build, accurately calibrated across 1–5 V, power cable + screws

Component tweaks:
Increase filter Cutoff frequency range (moderate)
Decrease Tune knob Control Sensitivity
Resonance Boost (moderate)
More authentic hollow Square wave shape.

Added exposed pads for important capacitors and resistors, that allows implement classic mods, change capacitors to film type and do the Dice roll (you can google about it - “TB-303 dice roll”)