Definitely something not right with this software/driver
. I use a lifecam 5000 for Skype and it's integrated microphone kept on failing - the only way to resolve it was to plug it into another USB port, once a port had been used it wouldn't work again so i couldn't plug it back into a previously used one. Once all the ports (8 of them) had been used I had to reinstall the lifecam software and drivers
. (This did not put me in a celebratory mood.)
Then during Skype calls the audio of the person I'd called would reverb or echo making the call impossible to listen to. Switching USB ports would fix it. Then the reverb started happening to all system sounds.
Going into VIA HD Deck and selecting independent headphones would sometimes fix it, sometimes not.
Solution for me was Add Remove Programs. Find the VIA install (wasn't actually called audio deck, can't recall it's name), and uninstalled it.
Everything works correctly now, using the normal Microsoft audio controller.