The Black Panel version is identical to the MST Stereo Output Mixer from Synthrotek - it offers 2 inputs per channel with one attenuator or amplifier to mix the signals. A jumper on the board can be used to configure the channels from unity gain to 6dB gain. At the output, the channels can be distributed to the left and right via the pan control. The signal can be picked up either via 3.5mm jack or 6.3mm jack stereo.
The Synthrotek MST series is currently Synthrotek's premium module line. It consists of various modules for the Eurorack and was developed by Synthrotek in collaboration with synthesizer pioneer George Mattson.
Synthrotek MST Stereo Output Mixer Black Panel