But, I plugged a pair of headphones directly into my OD pedal. It worked. It was actually decent sounding, considering one of the speakers in my headphones was already dead.

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1984 Squier Contemporary Stratocaster
1986 Peavey Envoy 110
1967 Kingston Acoustic

If you plug stereo headphones into a mono input its most likely that you will only get a signal through one side of the phones.You can circumvent that by using a stereo to mono adapter plug and this should give you a signal through both sides.

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'65 Strat,65 Mustang,65 Jaguar,4 more Strats,3 vintage Vox guitars,5 Vox amps,'69 Bassman with a '68 2-15 Bassman cab,36 guitars total-15asst'd amps total,2 vintage '60s Hammond organs & a myriad of effects-with a few rare vintage ones.

It was already burnt out. It happened when they were plugged into my computer. Thanks for the tip though.

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1984 Squier Contemporary Stratocaster
1986 Peavey Envoy 110
1967 Kingston Acoustic