Hello!
I need help with my perception test which looks similar to this one:
http://legolas.ling.su.se/staff/hartmut/we...t/test_i.se.htm
In my test there are however just audio-files. The problem is that I need to have control over number of replays of sound. I just want people to listen no more than twice. How can I do that? Please help me.

How are you displaying the audio files for the users? You might embed the audio in e.g. a Flash movie, but even then you can't prevent users from redoing the whole test.