Ok, my fault
Meanwhile I found a log file on the internet:
http://www.quanttrom.com/wp/wp-conte..._paritions.txt
It seems that you are right with your soundcard.
Unfortunately, I cannot check this myself because I sold my T1.
My last hint is ADB. At rotating arrows screen you should be able to log in via ADB shell - but only if ADB has been is installed and USB debugging has been enabled. You can install it manually - just have a look at the do_update.sh script in the enableadb package. And you can then enable USB debugging by editing /default.prop
With adb shell, you can check android logs via logcat command.