Originally Posted by fanta
... I have to get this question out of my system, as stupid as it is, so here goes.
When the Pico is connected to a 3.5mm port on a PC, is it getting any sound from the PC when there aren't any headphones connected? This is assuming it's turned ON but nothing is connected to its output. There's no reason why it should be in this state, but let's just say it is... is sound coming from the PC and stopping at the Pico, or if there's nothing to drive then the PC doesn't output anything to that port? And if it's off then is it any different? Yes these questions are pointless, I know, it's more of an OCD thing. 
When no headphones are connected and sound is playing on the PC, the Pico is receiving the signal (getting the sound) but not outputting it since it has nowhere to go. If the Pico is off and the PC is still plugged into it and making sounds, the audio is still reaching the Pico but the Pico isn't doing anything with it.
I hope this is good news for your OCD, if not, I'm sorry 
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Headphones: Atrio M5, Alessandro MS2(i), Sennheiser HD650, Audio-Technica ATH-W5000, Denon AH-D750
Amps/DACs: Meier Opera w/DAC, Little Dot MKIV SE, Channel Islands Audio VDA-1
Transports/Sources: Creative Audigy 2 ZS Platinum Pro for Desktop, MacBook Pro, 5.5G iPod, OQO Model 01
Cables: Signal Cable Analog Two IC's, Cardas for HD650's
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