Enabling GUI sound effects -> sound of external applications "lagg"

[level20peon]

TV-Server Version: tvengine3 Rev16582
MediaPortal Version: 0.2.3.0
MediaPortal Skin: Xface
Windows Version: Windows 2003 R2 SP2
CPU Type: Intel Core2 Duo T5600 1830 MHz
HDD: Samsung HD103UJ 1000GB
Memory: 2x1024 MB Corsair DDR2 667MHz
Motherboard: AOpen i945GTm-VHL
Motherboard Chipset: Intel 945GT / Intel ICH7MDH
Motherboard Bios: R1.05
Video Card: NVIDIA GeForce 6600 LE passive
Video Card Driver: Forceware 163.75
Sound Card: Realtek ALC882D HD Audio (onBoard)
Sound Card AC3: no AC3
Sound Card Driver: R1.82
1. TV Card: FireDTV BDA DVB-C (Floppy DTV)
1. TV Card Type: DVB-C
1. TV Card Driver: 02/04/2007, 4.8.0 BDA Driver
MPEG2 Video Codec: ffdshow / dscaler
MPEG2 Audio Codec: ffdshow / dscaler
Satelite/CableTV Provider: unity digital TV
HTPC Case: Silverstone LC11m silver
Cooling: 120mm Papst 4412F/2GLL / passive
Power Supply: mCubed EF16 160W external passive cooled
Remote: Gyration GYR3101US
TV: Panasonic TX-26LX50F
TV - HTPC Connection: S-Video


Hey guys,

I have had this problem for a long time but I never thought in this direction before. If I start an external application out of MediaPortal their sound "flickers" or "laggs". It sounds like the sound latency / sound buffer causes trouble. I always thought "hey, these applications are just configured wrong" so I tweaked their settings and I IMAGINED to be kind of successful. But actually I wasn't.
I recently disabled the "Enable GUI sound effects" setting in MediaPortal configuration and the laggs magically disappeared with it (reproducable).
So what could cause this problem ? Any hints ?
btw: The laggs continue to appear when I launch an external application and then kill MediaPortal. If I launch these applications outside MediaPortal everything sounds fine.

No logs on this, since there is nothing logged about it...


-level20peon


PS: Up-/downgrading audio drivers made no difference... Also trying different skins doesn't lead to anything...