How do you reverse the polarity of a track in GB?

I use GarageBand to mix multi-channel audio (while listening to a stereo mix) then export it to A.Pack or SurCode for the final 5.1 mix to disc. I have a less than one year old Pioneer 7.1 receiver and 5 polk audio speakers from my attempted home theater that i now occasionally use to watch DVDs on my mac (using the optical audio). I was wondering if i would be able to set the tracks to certain balances (i.e. FL -127 C+0 FR+127) to output a form of Dolby pro logic to my reciver to simulate a final mix, but to get a rear channel in the mix, i would need to make one of my rear tracks' polarity reversed. Is there a plug-in to do this, or any other suggestions?

A quick trawl in Google didn't throw up any Audio Units which would reverse the phase, but possibly if you did a more exhaustive search you might find one. This would be the easier answer.
Otherwise you could do it by getting 'Amadeus II' from
http://www.hairersoft.com
This costs $30.
To do this: choose the tracks you want to be on the rear channel. Centre them with the pan control and mute all the others. Export to iTunes. drag the resultant file to the dekstop and open it in Amadeus. Select one channel only.
From the 'Effects' menu choose 'Stereo Utilities' then 'Invert Phase'. Save, and then drag the file back into GarageBand. You can now mute or delete the tracks which made up this rear channel.
Strictly, to be a proper Dolby ProLogic track the rear channel should be Dolby B encoded: it might be worth turning up the top a bit to allow for this.
Remember that in playback on a ProLogic decoder the rear channel is filtered below 100Hz and above 7kHz (it is only intended as an effects channel).

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Alieufromwa wrote:
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How do you change the tempo of a track?

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Message was edited by: kostby

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How do you reverse the polarity of a track in GB?

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