Sometime on Jun 14, RB cobbled together some glyphs to say:
The sound was fine when the system started and I got the jingle tune too but after a reboot, it disappeared.
The sound module prolly isn't getting loaded or isn't mapped to the correct character devices.
What's the output of lsmod immediately after a reboot and after you try to play a sound. Also, show us what /etc/modules.conf (or equivalent) looks like