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...

Download LT SPICE https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html

SPICE simulation files for this video https://github.com/GadgetReboot/misc_file_bin/tree/master/2019-05/BypassCapSimulation

Impedance calculator https://keisan.casio.com/exec/system/1258032649

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Background music from the Youtube music library: A Rising Wave by Jeremy Blake Ridge Racer by DivKid ... https://www.youtube.com/watch?v=KidsecXSRg0