Minimal panning mixer

The idea is to have some number of input jacks (seven, here) mixed down to two output jacks, with each input representing a fixed pan position somewhere between the two extremes represented by the outputs. Plug a signal into the topmost input to send it entirely to the top output, the middle one to send it equally to both, etc.

From this discussion on lines:
https://llllllll.co/t/prototyping-nearness-a-minimal-panning-mixer-module/8330

https://github.com/sarnesjo/nearness