The polyphonic keyboard assigner

This module scans the 61 key keyboard and assigns the generated CV and gate signals to the 4 SEM modules according to the adjustments made on the front panel.

Actually, it should do so, upon arrival, no single gate pulse was seen, nor a correct CV.
A defective 723 caused most of the logic to be without supply. But once energized, a hand full of dead CMOS chips paved the way to a working assigner.

[Photo to follow]