Bypass Capacitors in Audio Circuits

I forgot to add a bypass capacitor across the voltage rail of a DC bias supply and it caused my analog signal to bleed through to the output of the circuit when it was supposed to be "off".

Using a combination of calculations and LTSPICE simulations I figured out a capacitor value that should work, then I tested it in circuit. I ran into another signal anomaly but that's for another day...

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