Moog Minimoog Operation Manual page 18

S-TRIG PLUG FOR MINI MOOG MODEL D
When inserted, this plug keeps the contour generators
"on" continuously. It can be wired to an accessory foot switch
for manual external triggering of notes.
NORM. OPEN
WIRING OF SWITCH TO S-TRIG PLUG
JULY, 1971 7 0 - 0 1 8