I'm designing a guitar headphone amplifier that uses a single supply op-amp as the output stage to the headphones. I'm using a potentiometer after the final JFET stage and before the op-amps as a volume control (so that I can keep the overdrive tone from the final JFET stage).
The part I'm unsure about is the C9/RV3/C14 part of the schematic. I've used C9 to block DC (from the JFET bias) to avoid potentiometer crackle, and C14 blocks DC to the inputs of the op-amps.
My question is, can I connect pin 1 of the potentiometer to V_gnd (currently connected to DC GND) and omit C14? If that's the case, does R14 stay connected, or does RV3's V_Gnd connection suffice as a reference for the op-amps? If RV3's connection alone is relied on, I'm worried that the changing resistance between the op-amp and V_gnd voltage divider will cause instability, but having both C9 and C14 seems superfluous.
Also, is DC GND the best point to connect C15 and C16, or would connecting them to V_gnd be beneficial?