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How does one *split* left from right to convert stereo to mono?

295 Views 1 Reply Latest reply: Dec 6, 2012 3:06 AM by HangTime RSS
Bert Sierra Level 2 Level 2 (285 points)
Currently Being Moderated
Dec 6, 2012 2:49 AM

My question *should* be simple to answer, but I’m finding little online to aid me.  I have a QuickTime Pro 7 license and actively use GarageBand, however, I’m stumped for what should be one very simple task:

 

What I have is a recently recorded QuickTime file in which the audio track consists of me speaking in the left channel and me *plus* a second audio track mixed into the right which is significantly delayed.  Stated most succinctly, I want to mute / drop the L channel and *only* retain the R channel, converting the result to an AIFF, MP3, or MOV which has a strictly monophonic track.  It’s a major no-no to sum L+R into mono because of the delay factor.  How to I drop L?

 

…on Macs this appears to be tremendously difficult.  I’m running OS X Mountain Lion 10.8.2, GarageBand 6.0.5, and QuickTime Player 7.6.6 w/pro licensing. 

 

Any tips?  ALL links that I’ve followed suggest the L+R -> mono approach which won’t work because of the aforementioned delay issue.

 

http://www.bulletsandbones.com/GB/FAQPages/StereoToMono.html

 

 

…thanking you in advance for your dead-on advice.

 

— Bert

iMac 2.66GHz Intel Core 2 Duo, Mac OS X (10.6.7), 4GB RAM, SuperDrive, Airport, 8-core Xeon Xserve

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