I too have this problem. Set stereo device in amarok engine config to plughw:Headset, works for one track play then reverts back to the default sound card.
danny@danny-desktop:~$ cat /proc/asound/cards
0 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfebf8000 irq 22
1 [Headset ]: USB-Audio - Sennheiser USB Headset Sennheiser Communications Sennheiser USB Headset at usb-0000:00:1d.1-2, full sp
I too have this problem. Set stereo device in amarok engine config to plughw:Headset, works for one track play then reverts back to the default sound card.
danny@danny- desktop: ~$ cat /proc/asound/cards
HDA Intel at 0xfebf8000 irq 22
Sennheiser Communications Sennheiser USB Headset at usb-0000:00:1d.1-2, full sp
0 [Intel ]: HDA-Intel - HDA Intel
1 [Headset ]: USB-Audio - Sennheiser USB Headset