Asbjørn Sæbø wrote:

When playing back audio on an Edirol UA-25 usb sound device, I am getting "crackling" sound (not unlike playing an old LP).

The crackles occur frequently, on average about twice or more per
second. They typically come in bursts, in between the series of crackles, there may be a second or two without any.
Have you got the UA-25 connected to a USB hub by any chance? This does sound very like a problem I've had in the past that was caused by problems with a hub. My problems have since been fixed in the kernel, but I think Lee has mentioned problems with the ehci driver in 2.6.14.

jch


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