Virtualbox and sound of Gnome apps


just installed opensuse 11.2 in Virtualbox (host XP). Sound works running KDE, audacity works too. Audacity’s setting of default output dev is “hw:0,0”. But GWC (Gnome wave cleaner) doesn’t work correctly, i.e. the sound is a crackling, distorted noise. This is the case either running it under KDE or GNOME. No changes when setting the GWC output device to hw:0,0.

Any suggestions?

Thanks and regards.