Purpose of capacitors in effects loop pedal

USMC 0369

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Bought one of the cheap Chinese loop pedals. Can anyone explain what the capacitors do in this circuit? Sorry for the crappy cell phone screen shot. The pedal did not come with any instructions.
 

freefrog

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These are 100nF caps in series with the hot wire so they act as high pass filters cutting only the lowest bass frequencies . Looks like an attempt to tame the hum, to me...
 




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