Available as an assembled Module and as a DIY project.
This Module is currently available.
Molten Modular's CV and Audio Utility / Realtime Visualizer
Motion MTR allow you to mix, attenuate and invert signals while having clear visual feedback of their levels. Each channel can function as:
Each input is normalled to 10v, so you can use each of them to generate fixed voltages. Also, the outputs of channels 1 and 2 are summed into Out 3 to be used as a mixer. Patch it wildly to make it work as an attenuverter with offset, as a mixer, a VU meter or a combination of them all!
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These merchants probably sell this module. Huh?