/diy/ - Do It Yourself

>>2005303
Honestly, I'd redraw your circuit diagram, with linearity. I.e. the signal always goes from left to right. Then probe where you're getting the noise, and probe back from that to find the source of the oscillation.

Pic related. I haven't drawn annotated boxes around anything so it could be better, and I've split it up to stop it being so long, but in general it's easy to read. Also it has some glaring issues that I had to bodge out, so don't copy it, though it's a circuit with very similar purpose to yours.
Important to note is the use of power nodes (Vcc, Vee, GND), the lumping of relevant parts of the circuit together (power cluster, main signal path, individual effects and switch), and the shortcutting of otherwise long interconnecting wires by using net labels (vGainIn, vGainOut, softClip, hardClip, etc.).