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

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.

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

https://reverb.com/item/93906191-gizm0x-x0x-heart-mods-eurorack-module-2026

• 100 mA +12V
• 10 mA -12V
• 0 mA 5V
• 45 mm Depth

This Module is currently available.