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USB vs. Onboard or PCI sound card

H

hanku

Junior Member
I've recently opted a very generic USB sound solution (speaker out, line-in, microphone) for my laptop. Before I connect the USB sound card to my PC, a MP3 file is playing through the onboard sound card/speaker. However when the USB sound card is attached, this currently played MP3 file is still being played through the onboard sound card/speaker despite the fact that the default sound playback device is the USB sound card. I have to stop and to restart the media player in order for the sound to come out from the speakers connected to the USB sound card. Does anyone have any technical explaination to this?

Thanks in advance!
 
Well that's simply because the "default" only applies when a program first opens a sound channel. When it's already running, it of course won't switch device unless the user explicitly tells it to.
 
I speculate that the USB sound card does not send an interrupt message to the "default" sound card, hence it requies the user to stop and restart the media player in order for sound to stream out through the USB sound card.
 
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