Available as an assembled Module and as a DIY project.
This Module is currently available.
MST Stereo Output Mixer (Synthrotek Panel)
The MST Stereo Mixer is intended for pannable stereo output, but it is also suitable for both AC & DC voltage signals (Gates, Triggers and Control Voltage).
Features:
- 2 channels, 2 inputs per channel
- Jumper select ~unity gain or gain ~x2 (6db boost) amplification
- Mixes both AC signals (audio) and DC signals (gates, triggers, CV)
- Stereo output with panning per channel
- Attenuator and amplifier per channel
- 1/4" and 3.5mm (1/8") matching stereo output jacks
- Black & white panel option
These merchants probably sell this module. Huh?