Please explain the purpose of following circuit
For one thing , it's an "Audity" of a drawing.

The author didn't know standard practice , so just invented a way to boost VCO2 with some kind switch on the tip which is usually done on the ring such as below. This seems to show to show how to bridge/bypass a path when connected. R227 is a "really" tiny 27K resistor with I recall the old RCA 3080 OTA used as a V-Ctrl gain .

Maybe it belongs on one of these panels?