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."