http://bugs.winehq.org/show_bug.cgi?id=29768
--- Comment #1 from Andrew Eikum aeikum@codeweavers.com 2012-02-02 08:11:10 CST --- Thanks for reporting.
Can you attach a log with the channels from http://wiki.winehq.org/Sound?
Also, which MIDI synthesizer are you using (timidity, fluidsynth...?)
Just to be clear, the problem you're reporting is underruns in Synthesia, correct? dssi-vst is working fine?