intel ich7 audio makes a scratchy sound

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i have a solaris express developer edition 1/08 wit the latest oss driver
SunOS nebuchadnezzar 5.11 snv_79a i86pc i386 i86pc
when the sound play's any audio file in any whith the audio comes a scrathy noise.... the sound controlles work fine moving the volume up and down but i don't know what to do to fix this litle problem .have anyone had the same problem or knows how to solv this ?!

thanks