501E

Dual Oscillator Expander

The OSCILLATOR EXPANDER adds more inputs and outputs to the 501D dual oscillator.
Ten output jacks provide the individual waveform outputs of oscillator 1 and 2: sine, sawtooth, triangle, rectangular and pulse.
The four inputs expand both vcos by linear frequency modulation and hard sync.

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