No Problem when:+ powered USB hub between PC and sound card "sound OK" ( "bad sound" without power )+ The REALLY WEIRD: if I increase CPU usage, e.g. if I move a window in Windows continuously the output is OKCould it be due to the USB power? (Not yet measured)
Could it be speed of USB?
As this looks to be CPU load related, sometimes power saving schemes can hav a very negative impact.Try disabling the power saving
Hi RosevalThanX for the fast answer!Tried it -didn't changed anything.If I understood you the right way: Power management settings: Configurated like :http://www.ehow.com/how_5097708_turn-off-power-saving.html(In all cases "never")
Could it be speed of USB?My PC has USB2.0, however I have not found out about whether "Hi-Speed" or "Full Speed"
Reinstall chipset drivers, check DMA settings if you have ATA drives.And btw, you are sending signal waaay into overload and clipping, judging by the recording.
It seems illogical that it should work better at high CPU loads, but try checking the DPC latency.http://www.thesycon.de/deu/latency_check.shtml
you could also have a look into your system's BIOS settings and see if "spread spectrum" is enabled or notas a test you could change that setting, retry playing back without CPU load and see if the problem persistsCheers,Maggi