[Ubuntu Wiki] Update of "DebuggingSoundProblems" by diwic

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The following page has been changed by diwic:
http://wiki.ubuntu.com/DebuggingSoundProblems?action=diff&rev1=56&rev2=57

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  == Preliminary checks ==
   1. Is your sound system plugged in and switched on.  I spent an hour trying to diagnose a sound issue when the problem was that I had switched off the speakers to answer a phone call and forgot that I had done so. :-(
-  2. Is your speaker or microphone muted? Check here:
-    [[Audio/CheckForMutedSpeakerVolume|Check for muted speaker]]
-    [[Audio/CheckForMutedMicrophone|Check for muted microphone]]
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   2. Is your speaker or microphone muted? Check here (9.10 and later) :
     * [[Audio/CheckForMutedSpeakerVolume|Check for muted speaker]]
     * [[Audio/CheckForMutedMicrophone|Check for muted microphone]]
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  == Checking volume levels ==
  Before messing around with uninstalling and installing various sound programs to fix a problem, check your volume levels.  It is often the case that a muted channel is the problem, even though the description may not sound immediately relevant.  In this regard, muted Surround or Center channels are common culprits. So unmute and raise the volume of one channel at a time and check whether sound is then produced by a running sound application e.g. Rhythmbox.