I am running VirtualBox in Snow Leopard 10.6.2 and have had an ongoing problem since 9.10 came out. ANY Linux distribution based on Ubuntu 9.10 may or may not start with sounds running slow, i.e. at the wrong sample rate. It doesn't happen with any Window's guests XP,7 etc, doesn't happen with Fedora 12 and others, and doesn't happen with any Ubuntu based distro prior to 9.10.

I really wish someone could figure out why. Based on the fact that so many other guests don't have sound issues, I can only surmise is something in Ubuntu 9.10 or other Linux distros with a similar audio setup.