Available as an assembled Module and as a DIY project.
This Module is currently available.
8 Input Mixer Module V2
2 cascaded 4-channel mixers. This means that if no output is plugged in to OUT 1, you get 8 inputs into OUT 2, with a level-setting for OUT 1's 4 input-channels. If OUT 1 is plugged in, it is two 4-channel mixers. Useful for using modules with stereo-outputs.