Looking at the PCB, something needs to be corrected. While your routing is less complex than mine, the GNDs have to be addressed.
In audio, each stage must have its own individual GND and all GNDs must come together and GND at only one point. GNDs cannot be shared among stages, as it creates a ground loop and allows noise to be introduced. That is why I had each stage’s GND tracing to the bypass cap.