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This is the excerpt from the 2VCO synthesizer unit. Someone, please, can explain me what is this strange arrangement with VCO2 Out jack through the switch inside of it? I understand that when the Jack is inserted I have clear VCO2 voice output. But when the jack is out, the switch inside of it shorts to 6/10. What is the purpose of it? Big big thanks is advance.

enter image description here

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  • \$\begingroup\$ Please don't thank in advance. Thank afterwards by accepting and upvoting useful answers. \$\endgroup\$ – Transistor Apr 6 '18 at 18:05
  • \$\begingroup\$ @transistor I like it when people thank me in advance, saves me from writing an answer \$\endgroup\$ – PlasmaHH Apr 6 '18 at 21:49
  • \$\begingroup\$ who else will mention my advanced thanks? \$\endgroup\$ – Roman Apr 6 '18 at 23:27
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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.enter image description here 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? enter image description here

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  • \$\begingroup\$ No . This is the schematics of the Kobol Expander I synth. \$\endgroup\$ – Roman Apr 6 '18 at 18:02

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