Snd_usb_audio does break when using a headphone

Whenever I plug in a headphone pulseaudio on KDE 4.12 works perfectly fine and I can use kmix (well...) or pavu to adjust settings just fine.
Though when playing a game with system wine 1.7.15 (but this is the same with other versions) I get crackling sound ONLY on that game. The other apps still play nicely at the same time through the same headphone.
Now checking journalctl I repeatedly get two problems with pulseaudio:
-: [alsa-sink-USB Audio] alsa-sink.c: this is probably an error in the alsa driver snd_usb_audio
and
-: arch pulseaudio[4210]: [pulseaudio] pid.c: Daemon already running.
I understand that wine (64bit by the way) still uses the alsa stuff on top of pulseaudio (which I think is annoying).
I don't understand why asla doesn't deliver the sound to pulseaudio so PA can send it out to the headphone. Why does alsa even load snd_usb_audio in the first place...
I'd really appreciate some help here.
thx for reading,
piedro

I just noticed something else - When I go into the midi setup in OSX and play around with the channel 1 and 2 volumes for output I can get it to sound perfect if I mute one of the channels when plugged into headphones...

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