This module combines 2 utility mixers with the TAU Pipe Phaser, one of the most iconic analog phasers.

Dual Mixer
Uses Ultra-Low-Noise, Low-Distortion Burr-Brown™ Audio op-amps
Top: 3-in-1 audio mixer with Phase inverter for IN 1
Bottom: 3-in-1 CV or audio mixer with additional Aux input

TAU Pipe Phaser
Based on Jürgen Haible's version of the ultra-rare Trine phaser.
2 audio inputs
Extensive CV control
Temperature compensated
Pseudo Stereo output

https://serge-modular.com/serge_4x4?mod=RS_MIXTAU4X4