This Module is currently available.
2 Channel Bipolar Mixer
BiMix is a 2 channel bipolar mixer.
The default output gain is x1, and you can change the gain to x2 by moving a cap switch on the bottom side of the module.
2 input channels are normalized by 5V. So, when one input channel is not patched, It's gain slider is used to control offset voltage.
Also, you can chain BiMix modules by connecting "BKOUT" and "EXTIN" connector on the bottom side.
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These merchants probably sell this module. Huh?