squeezelite and USB DAC

[Killerbee]

Ok I am a happy xbian user since alpha 5.

I can remember in alpha 5 I was able to run squeezelite as a daemon next to xbmc without any issues.
recently I was trying to install squeezelite again, but unfortunately I get very bad quality audio (cracks and sometimes very slow) on my soundblaster play!

I tried various things:
-.- various alsa buffer options -a 80:4, -a 160:4, -a :::16: etc
-.- stopped xbmc and run squeezelite "dedicated" result is the same
-.- intalled squeezeslave, result is the same!
-.- disabled zram (set size to 0) result is the same
-.- disabled btrfs autodefrag, result is the same
-.- dwc_otg.speed=1, result is the same

I think it has to do with firmware/kernel.

So my question is. Is it possible to install the alpha 5 firmware (and kernel?) in Beta2?
Also I like to use the "cmdline.txt from alpha 5"?

Or maybe somebody has a good suggesion?

KB