MATRIXSYNTH: Eurorack polyphony in 52 HP (single filter)

Sunday, May 24, 2020

Eurorack polyphony in 52 HP (single filter)


Published on May 24, 2020 joeSeggiola

"My personal take on polyphony in Eurorack. Recorded in spring 2020.
DIY MIDI to 4x CV/gate interface: https://github.com/joeSeggiola/arduin...
MI Stages custom firmware: https://github.com/joeSeggiola/eurora...

Patch notes, from left to right:

- A DIY MIDI interface (link above) allocates notes polyphonically from the keyboard into four channels of CV/gate. The additional top-most gate output is a combined OR.
- CVs are sent to Chord v2 in Unison Poly Mode: each oscillator is controlled independently by its own 1V/oct input.
- Gates are sent to Stages, which runs a custom firmware (link above) that generates five identical envelopes.
- Veils uses four of these envelopes to drive one VCA for each of the four voices coming from Chord's individual outputs.
- WMD SSF Pole-Zero filters the final mix from Veils; its cutoff is modulated using the fifth envelope from Stages, the one triggered by the OR-gate signal.

[ 0:00 ] Overview, simple melody
[ 1:13 ] Filtered chords
[ 2:04 ] Overlapping arpeggios
[ 3:44 ] Wavetables exploration

I'm not claiming this is the way to get polyphony in Eurorack, I'm just sharing the result of my latest DIY and coding projects."

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