[beagleboard] No sound on C-Media USB Headphone Set (USB 2.0)

Hello, I plugged in a C-Media soundcard in het BBB (on Ubuntu 13.04). Everything looks ok but there is no sound. The green led is burning. I also changed the alsa-base.conf to make the C-Media sound card the default but that didn't work. I did the following: ===

[beagleboard] C-Media USB 2.0 Headphone Set no sound

Hello, I plugged in a C-Media 7.1 sound card in the BBB with Ubuntu 13.04 (SD card boot). Everything looks allright but there is no sound. Also the C-Media didn't become the default sound driver. Please help. I did the following: