x0x-heart MODs is a faithful analog recreation of the iconic Roland TB-303 bassline synthesiser voice, packed into a compact Eurorack format. This module delivers that classic 303 acid sound with modern enhancements and build quality – perfect for techno, acid house, or any modular setup craving authentic analog bass.
It includes the classic analog oscillator, ladder filter, VCA, envelope generator, and accent circuitry that made the TB-303 legendary for acid basslines and squelchy leads. No built-in sequencer (pair it with your favourite Eurorack sequencer for full control).
Key Features & Improvements by gizm0x:
- Extensively tuned and refined based on years of repair experience with original TB-303 units for authentic sound and stability
- Four additional modification switches over the standard x0x-heart:
- Bass Boost switch – Adds extra low-end punch
- Resonance Boost switch – Pushes the filter resonance further for more aggressive squeals
- Envelope Modulation Increase switch – Deepens the envelope’s impact on the filter for more dramatic sweeps
- VCF High-Range Shift switch – Extends the cutoff frequency range for brighter tones
- Redesigned PCB for better reliability and maintenance:
- Dual-row connectors to eliminate past contact issues
- All calibration trimpots moved to the rear for easy adjustments
- Key capacitors upgraded from MLCC to film types for improved audio quality
- Internal routing of previously exposed wiring cables
Power: +12V 100mA / -12V 10mA
