Toppobrillo - Matrixplexer (Silver)

The Toppobrillo Matrixplexer is a 4x4 matrix mixer with built-in scanning. Matrix mixers on their own are already endlessly useful — any input can be routed to any output, at any level, for complex feedback, signal distribution, and creative CV routing. Scanning mixers are a different kind of useful — they let you move between sources over time, typically with CV. Combine the two in a single module and the possibilities quickly become hard to count: mix movement, spatialization, sequenced routings, syncopated rhythms, evolving feedback networks, clocked swells and pans.

The Matrixplexer offers four DC-coupled inputs and four output mixes with mute switches, plus X and Y axes that actively sweep through the cross-points. Each axis has three scan modes — Scan (exclusive, position-mapped selection), Stack (all channels in a row or column opening consecutively) and Scroll (internal through-zero LFOs sweeping the matrix continuously in any direction). The Shape control sets the crossfade curve between channels, from hard switching to linear blends. The two axes operate independently, so a clocked scroll can run on X while Y sits static, or both can scroll at different rates. A Clock input locks scanning to external timing, separate Row and Mix CVs gate individual channels on top of the main X/Y scan, and low-noise linear VCAs handle the signal path throughout. A rear header is included for future digital expansion.

A great, flexible centerpiece for spatialization work, generative mixing, and feedback experiments.

Features:

• 4x4 scanning matrix mixer, 24 HP, 30 mm deep
• 4 DC-coupled inputs, 4 output mixes with mute switches
• Three axis-independent scan modes: Scan, Stack, Scroll
• Scroll mode runs internal through-zero LFOs for continuous matrix sweeps
• Shape knob and CV — crossfade slope from hard switching to linear blends, up to multi-channel gating
• Clock input for syncing scanning to external timing
• Row and Mix CV inputs add to X/Y scan CVs and gate respective channels
• Low-noise linear VCAs, post input attenuators
• Digital expansion via rear header