Noise Issue When Playing Through Usb
 

Hi everyone,

I have a VIRUS TI Desktop, RME Fireface 400, Macbook Pro, Logic Pro 9.1.8.

I run the Virus via USB into the computer.

Every sound I play comes out with a noise and crackle which keeps going for a few seconds after the sound has stopped.

I have uploaded a file test here for you to have a listen to, so you know what I mean. http://www.mediafire.com/download.php?lyjeto35fe32xa7

I have tested it via Analog Outputs and the noise was gone, so the issue is the USB connection. Is this a known issue ?

How can I fix this?

Thanks.