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I noticed that the voltages at the power supply pins of your ICs are not consistent nor symmetrical. That is going to cause asymmetry in the waveshapes. Pins 4 and 8 of U3 and U5 should be at -11.8 and +11.8, as should pins 11 and 4 of U6 and U7.
https://electro-music.com/forum/viewtopi...735#450735