Marbles Symbiote v0.3.0

Alternative Symbiote firmware for Mutable Instruments Marbles — a self-contained generative drum + acid bassline machine (Grids drums on the T-section, TB-3PO bassline on the X-section), plus two extra standalone T-section models.

Install the .wav via the standard Marbles firmware-update procedure.

Fixes

• Full-range drum density CV. The RATE / BIAS / JITTER CV inputs (BD / SD / HH density in Grids mode) now reach maximum density. The mapping is unipolar: 0 V leaves a voice silent, +5 V drives it to full, so a 0–5 V envelope or LFO sweeps the whole range.
  • Previously the bass-drum density was hard-capped at roughly half — no CV could push it to maximum.
  • Previously negative CV on any density input could wrap the internal density byte and glitch to spurious full density; it is now clamped to silent.
  • Note: with nothing patched into a density input, that voice is silent — patch a CV or a fixed offset into each drum voice you want to hear.

Assets

• marbles.wav — firmware-update audio file (install this one).
• marbles.hex — Intel HEX, for JTAG / SWD flashing.