Noises on external USB audio interface (Yamaha MW12) with Snow Leopard

Hi there,
I got an issue with strong noises (kind of distortion) while playing all kind of music/sounds ( itunes/Reason/Cubase) via an external USB audio device (Yamaha MW12 mixer).
Some important facts:
+ This had not been from the very first beginning of changing to snow leopard
+ but never appeared on "leopard"
+ Yamaha mixer is still working fine with my MS-windows computer
+ latest Asio driver by Yamaha is not helping.
+ internal audio of my Mac Book Pro is working fine.
As this issue just appears 2 days before, without any change or installation on my system, I really wonder, what could be happen. As Yamaha mixer is still working fine with other computer, I expect some driver in MacOS to be the problem (as internal audio HW is working fine).
Does anybody else, know, what to do? (before I change back to MacOS 10.5)
Has anybody else have seen a similar issue?
Thanks for helping in advance.
Merry christmas,
Mat
Message was edited by: d-trich

Hi,
just one addon.
+ Changed USB ports on MacBook and it was fine on the second used.
+ Nevertheless, noise remains on the originaly used port
+ all other connected devices as mouse and midi interface are fully functional on both ports
It still looks like a driver issue. Nevertheless, could it be a hardware issue with the USB port in my MacBook then? Even if all other tried devices are functional?
cheers, Mat

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