according to the FAQ and Support page, referred to for additional post-installation tasks, you have to comment out 'out(radio)' in the ls_script.liq if you do not use the soundcard. I used this because my server does not have a soundcard. The script has changed in the 1.6.1 version.
Is there still something to # if you do not use a soundcard or am i correct in my assumption that the script now check for one and automatically and switches the use of it off or on.