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This may be a stupid question, but does anyone know if it is possible to output audio from both the 3.5 audio out as well as the inbuilt speakers on a MBP model MB133*/A?

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Typically for a laptop soundcard that has both internal speakers and a headphone out, there is only one amplifier, and the output can either go to the speakers or headphones, not both. Often the switching is analog - plugging in the headphone jack physically breaks the circuit going to the speaker while connecting the signal to the jack.

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Cheers for the response. Makes a lot of sense. – JT.WK Feb 22 '10 at 1:48
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You could create an aggregate audio device that contains the outputs for those two outputs stuck together into one device you can select in the audio settings. This will theoretically work.

http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh1096.html

You'll find info in the mac help and a little tutorial here: http://support.apple.com/kb/HT3956

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Thanks for the response. I have tried the above, however for some reason the internal speakers and the headphone output display as only one device - the source just changes when I plug in / pull out the audio cable :( Any ideas? Cheers! – JT.WK Jan 20 '10 at 20:56
I would guess it is not possible then. It may be hardwired to act as the same device. See here as well discussions.apple.com/thread.jspa?threadID=424092 – Sam Jan 20 '10 at 22:07
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