It seems sound only does not work for streaming music. It works for multimedia. I have checked my settings, retoggled, clean installed, had other people verify stream was working, etc., but cannot get streaming music on any sim to play. I really love this viewer, its speed and stability, and have been ignoring the sound issue because the viewer works perfectly on my system. This is a big first in the 7 years I have been on SL and especially for an OS X version! Thanks for all of your hard work!