This Module is currently available.
4HP stereo mixer
Want to mixdown your stereo audio signals simple and fast..?
This is the our solution!
Does was it says on the tin; 3 stereo signals mix down to 1 in just 4HP.
The inputs are normalized.
https://www.etsy.com/listing/1884533244/stereomix-4hp-eurorack-stereo-mixer