1.) Change the Master Channel in KMix
Right-click on the speaker icon in the system tray. Then choose the "Select Master Channel". Make sure USB PnP Sound Device is selected and click on OK.
2.) Change the default Audio Output preference in Phonon.
Open die KDE menu. Select the Computer Tab and then System Settings. Go down to the hardware section and then click on the multimedia icon. On the next screen select the Phonon tab. Select Audio Output and then click on the Prefer button to move 'USB PnP Sound Device' to the top of the list. Click Apply.
