Help! Something freakish has happened to my audio output

I have no clue what I've done, but suddenly I am only getting audio output from odd numbered tracks on my timeline.
There is no problem with the source audio, it's fine, I checked it.
What should be happening is that Track 1 (and all subsequent odd numbered tracks) come out of my left speaker, and Track 2 (and all even tracks) out of my right speaker. ie dual mono.
Suddenly I'm getting Track 1/odd tracks out of both speakers, and Track 2/even tracks out of none.
This is probably something hyper simple and obvious but I have no clue what it is. I even tried trashing the Prefs and fiddling with user settings. Changing User Prefs: Audio Output: Default Stereo Prefs (it's normally on a custom dal mono setting) makes no difference at all.
Please please someone help because it is going to be an absolute nightmare only working from alternate tracks.
Dual 2.5ghz G5 Mac OS X (10.4.8) 4gb RAM, 250gb HD

Thank you - I did check that - but it wasn't that. After rebooting and preferences trashing multiple times and even buying new speakers, I finally found out what it was.
In the Apple System Preferences: Hardware: Sound: Output the Balance was set to left. I have absolutely no idea how this occurred, I didn't even know this setting existed and I hadn't accessed any system preferences for days. The sound "vanishing" happened mid-edit - one moment I was working on the timeline, the next half the sound had gone. I do have some memories of the speakers crackling, but I don't know if it was around the same time or not. The (old) speakers are working absolutely fine now the Balance is set back to the middle.
So I can only assume there is some very very obscure key combination that I inadvertently pressed that changes the system audio output balance. Or another application such as iTunes messed with it. It remains a mystery, but thankfully things are back to normal!

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