Guys, help me please.
Although this problem isn't critical, but strange.
Strange volume problem.

Proc. E8500 Std clock (3.16 Ghz dynamic speed)
Mem. Kingston 2x2GB PC6400
VGA. Winfast PX9800GT 512 MB DDR3
PSU. Xigmatek NRP-651
HDD. All WDC (2x80, 1x320, 1x500, 1x640)
OPTICAL. LG DVDROM + LG DVD+-RW
Speaker : Logitech Z-2300 (2 satelite + 1 sub)

Problem :
First, setup audio setting to 2.1
Play anything fine, audible enough.

Second, setup audio setting to 4.1
The sound came out from speaker become louder.

Second, setup audio setting to 5.1
The sound came out from speaker become louder than 4.1

Second, setup audio setting to 7.1
The sound came out from speaker become louder than 5.1

All that strange things happen with volume level in speaker and audio panel remain the same.

BUT, this problem only happen to certain applications.
1. Media player classic
2. Some games (X-Men Wolverine : Origins)
and perhaps some other applications

Thank's