HELP! Unwanted Oscillation…

Coda

Well-known member
Preface: this isn’t a troubleshoot thread as much as it is a “help me understand” something. I am currently designing a distortion circuit for the purpose of learning how circuit design works. I started with a basic circuit (Electra), and started building up from there. I’m working on getting the schematic typed up. For now the attached picture will have to suffice…

I get distortion and all that, but certain notes oscillate…like a ring mod sound. What would cause this?
 

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