Open up your UnrealTournament.ini file and find the following section:
Look for this line right at the top of that section:[Galaxy.GalaxyAudioSubsystem]
UseDirectSound=True
UseFilter=True
UseSurround=False
UseStereo=True
UseCDMusic=False
UseDigitalMusic=True
UseSpatial=False
UseReverb=True
Use3dHardware=False
LowSoundQuality=False
ReverseStereo=False
Latency=40
OutputRate=22050Hz
EffectsChannels=16
DopplerSpeed=9000.000000
MusicVolume=0
SoundVolume=192
AmbientFactor=0.700000
Change the word True to False. Then the problem will be gone.UseDirectSound=True
Tommy