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There are a number of issues involving sound on Hoary Hedgehog (5.04). This outlines some fixes for some common problems.

Firefox and Flash player sound

• This fix is to make sound play with the flash plugin
• sudo ln -s /usr/lib/libesd.so.0 /usr/lib/libesd.so.1 (in the console, of course)

XMMS

• press ctrl+p and select libesdout.so as the output plugin and click apply.

Xine:

• switch level_experience to Master of all known bla-bla-bla...etc...
• goto audio
• audio driver: (alsa or oss) (alsa was the first to work, now they both work)
• oss audio device number (1 or 0) (1 was the first to work, but now 0 is working to)
• offset for digital passthrough ( 0 )
• always resample to this rate ( 0 )
• enable resampling (auto)
• go ok and restart xine.
• insert a DVD and press g to show the controls.
• now click in the pseudo-up arrow left to AUD: and put it to 0 or 1 (1 was once again the first to work, but now its even working with auto ( 0 i suppose).

Polypaudio:

• Installing polypaudio and replacing esound as your sound server also seems to work.

For all other probs try:

• in a Terminal, fuser /dev/dsp (the process that is using the sound system - my system nx7010)
• in a Terminal, kill [number of process given by fuser command]