gizm0x - x0x heart MODs Bass Synthesizer Voice
€449.00
Net: €377.31
Pre Order 5 October 2026
| U | 3 |
| HP | 18 |
| Depth | 45 |
| +12V | 100 |
| –12V | 10 |
gizm0x x0x-heart MODs — Analog TB-303 Bass Voice with Accent, Slide and Four Extended Sound Modes
The x0x-heart MODs is a complete analog bass synthesizer voice for Eurorack. It’s essentially the full sound-palette of the TB-303, sans the sequencer. It combines an oscillator, resonant low-pass filter, envelope, VCA and the accent and slide circuits associated with the Roland classic. Connect pitch, gate of a sequencer of your choice, and you are good to go. The design is based on the open-source x0x-heart by Open Music Labs and has been extensively revised by gizm0x.
Four switches take the circuit beyond its standard operating range. HI-RANGE extends the filter upwards, RES.BOOST increases resonance up to self-oscillation, ENV.M.INC gives the envelope a stronger influence on the filter, and BASS BOOST adds a substantial lift to the low end. The internal saw and square waves can be selected or combined, while an external oscillator may replace or mix with them before the filter. Separate VCF and VCA outputs provide further patching options.
The redesigned PCB uses improved connectors and rear-mounted calibration trimmers, with each unit individually adjusted in Japan. It remains a focused bass voice rather than a complete acid box — bring your preferred sequencer, and the rest is already wired for trouble.
Features:
- Fully analogue TB-303-style synthesizer voice
- Internal sawtooth, square or mixed waveform
- 1V/oct pitch input and gate input
- Four-octave pitch-CV range
- Separate accent and slide trigger inputs
- CV control of cutoff, accent, envelope modulation and decay
- Resonance boost extends the filter to self-oscillation
- Extended cutoff and envelope-modulation modes
- Switchable bass-boost circuit
- External oscillator input with internal/external mixing
- Separate pre-VCA VCF and final VCA outputs
- Rear-mounted calibration trimmers
- Reverse-polarity protection
- Individually calibrated and tested
- Built in small batches in Japan