I've had some sound problems in MX-15 with VLC and Trinity. The issue
is solved... sort of.
This is a link to the discussion:
http://forum.mepiscommunity.org/viewtopic.php?f=100&t=40197
The short version is:
After I installed KDE Plasma Desktop, the problems cleared up.
Recently, they started again. If I log out of TDE, log into Plasma
Desktop, log out of Plasma, then back into TDE, I have sound again in VLC.