7 to1 mixer

7 input 1 output mixer

Mixer for the seven waveforms of an ondes Martenot. This is a simple, op-amp based, non voltage controlled mixer.
Overall gain is around 0.25 allowing multiple waveforms to be combined without clipping. Some makeup gain following the module may be helpful.

There is no voltage control, so this depends on high quality log sliders. Its actually easier and better to use VCAs here.