3Σ

Triple channel
 dual bus modular audio mixer

3Σ is a module for eurorack which allows you to mix three audio sources into two separate mono buses or a single stereo bus.
With discrete studio grade output section based on legendary Flickinger operational amplifiers it delivers excellent sound with unique character.
While simple, it can play two different roles with a press of a button. While button is lit, the module is in stereo mode and dual mono mode is engaged when the button is dim.

— Stereo Mode
Left set of knobs adjust overall level of signal, while right set of knobs act as a pan between them.
— Dual Mono Mode
Left set of knobs adjust level of signal to be mixed into Σ1 and right set knobs adjust amount to send to Σ2.

https://monomono.audio