Sound /Audio Volume Lowers when playing Video (1 Viewer)

[Dadeo]

When I am playing videos (of all different codecs) my sound volume lowers. If I Pause/FF/Rew it goes back to normal for a few minutes then goes lower again. Has anyone else had this problem or knows a solution?


TV-Server Version:
MediaPortal Version: 2.3.0
MediaPortal Skin: PureVision
Windows Version: XP SP2
CPU Type: Core2Duo 2.4GHz
HDD: Seagate 500GB, 300GB, 250GB
Memory: Kingston 2GB 1067 Mhz
Motherboard: Intel DG965WHMKR
Motherboard Chipset:
Motherboard Bios: Intell MQ96510J.86A.1612.2006.1227.1513
Video Card: Nvideo 8600 GTS
Video Card Driver: 162.18
Sound Card: Sigmatel 7.1
Sound Card AC3:
Sound Card Driver:
1. TV Card: Hauppauge WinTV PVR 150 MCE
1. TV Card Type: Analog
1. TV Card Driver: 2.7B
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec: Klite Codec Pack
Satelite/CableTV Provider:
HTPC Case:
Cooling: CoolerMaster
Power Supply: CoolerMaster 600W
Remote: MCE R6
TV: Aiwa CT202
TV - HTPC Connection: Composite