Hello
I’ve this problem with blender (2.49b & 2.5 alpha 2). it doesn’t play any sound strip in the sequencer or game logic. Nor scrubbing nor playing it back.
I found out this with a terminal
export SDL_AUDIODRIVER=alsa && blender -g noaudio
IT opens blender but nothing. The terminal just keeps writing
NO AVAILABLE AUDIO DEVICE
Also tried adding SDL_AUDIODRIVER=alsa in /etc/environment with gedit.
How can I make it to detect it.
thanks in advance
I found the way to solve it by opening a terminal, I have tried it in the 2.49b version, and works there.
export SDL_AUDIODRIVER=pulse && blender -g noaudio
To ubuntu do it automaticly. open a terminal and write:
sudo nautilus
then add your password.
This will open a browser, in which you will serchh this address /etc/.
Feom there look for environment and open it by right-clicking and selecting gedit.
In the text editor write this at the end of it
SDL_AUDIODRIVER=pulse
then save it, restart the cpu and enjoy.
remember to activate sync and scrub in blender.
any ideas of how to activate sync and scrub in blender 2.5?
I will answer myself. 
I found the scrub and sync options are now in the timeline window.
regards
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