Motion MTR allow you to mix, attenuate and invert signals while having clear visual feedback of their levels. Each channel can function as:
Audio level control with VU meter
CV attenuator with voltage meter
CV inverter with voltage meter
Each input is normalled to 10v, so you can use each of them to generate fixed voltages. Also, the outputs of channels 1, 2 and 3 are summed into Out 4 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!