EDIT: It looks like 3.013 runs on my comp well and doesnt lose the mouse and doesnt do sound things. The sound problem seems to be introduced at 3.014, and wasnt fixed at 3.015. I am currently updating my client and will soon jump back into the world. The problem has something to do with Planeshifts core audio. I do hope developers fix this problem is the future.
PS: My sound card is built in but its known as Texas Instruments TAS3004, introduced to iBooks at Late 2004.
EDIT: Nvm, looks like it still does it