501M

Dual Oscillator Mixer

The OSCILLATOR MIXER blends the combined outputs of oscillator 1 and
2, plus three individual outputs of oscillator 1 (sine, sawtooth, pulse) and white noise. The attenuators allow to invert the source signals, too.
Each channel has its own mute switch with a LED.
The three out jacks provide a mixed output of both oscillator sources plus two individual outputs for vco 1 and 2 overriding the six mute switches (always ‘on’).

http://lunar-experience.com/DOWN/501M.pdf