TB-303 analog voice module with 4 MOD switches for enhanced acid sounds.

Faithful analog recreation of the Roland TB-303 bassline voice.
Features classic analog oscillator, ladder filter, VCA, envelope generator, and accent circuitry.
No built-in sequencer — pair with any Eurorack sequencer.

Additional MOD switches:
- Bass Boost: Extra low-end punch
- Res. Boost: More aggressive filter resonance
- Env. Mod Increase: Deeper envelope modulation on filter
- VCF Hi-Range: Extended cutoff frequency range

Power Supply Specifications
Powered by +12V and -12V only.
+5V is not required.
Connected via a 10-pin box header.
*NOTES
Incidentally, while the nomal model of the x0x-heart, suffered an irreparable failure if the + and - terminals of the power supply were reversed, this is not an issue with this product.

Calibration is easy
All trim pots needed for calibration are located on the back.

Redesigned PCB for better reliability, film capacitors for improved audio quality, individually calibrated.