How to convert stereo to mono?

First of all, I'm sorry if I'm posting in the wrong place, but I couldn't find any other sub-forum that was more appropriated.
I have a bunch of mp3 stereo files that I want to downsize. I'd like to make them mono and maybe lower their bitrate.
I'd like to know if there is a way to do that inside mac os X or if I have to use a specific software. If so, what soft do that better?
Thanks
Adriano

You can do it with iTunes. In its "General" preference, click "Import Settings", set "Import Using" to MP3 Encoder", set "Setting" to "Custom", set "Channels" to "Mono", and set the desired bit rate or quality.
Hold down Option and use "Convert to MP3" from the "Advanced" menu to select the files to convert. You can select multiple files using the Shift or Command keys.
The resulting files will be in the iTunes library. You can right-click and use
"Get Info" to find their location on the hard drive if you want to move them.

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How to view 'stereo' vs 'mono' in GarageBand 10.0.2?

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Tjed wrote:
Could that have something to do with why I got no sound out of the external monitors (speaker)?
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How to convert false (dual mono) stereo files ?

I imported an enormous amount of regions from a Final Cut Pro project, and because the cameras each had mono mics but were recording audio in stereo, all the audio files are technically stereo, but contain only mono information.
So I've got hundreds of stereo-interleaved files in my Logic session, but each file contains only mono information, so my project is twice the size it needs to be.
Can anyone suggest a way to remove all that redundant information ? What I want to do is split all the interleaved files, then select all the .R files and delete them, but I don't see any way to accomplish this in Logic, other than file-by-file (I have 500 of them...)
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Hey, thanks for all the suggestions, Seeren!
I'm not sure how your method is generating only .L files for you--when I split interleaved, I always get both sides... but not a big deal. It's easy enough to delete half the audio.
The real problem is getting the files replaced without losing all the arrange work: your method requires manually replacing the old stereo files with the new mono files in the arrange, which would be a ton of work in large projects like mine...
But... I did find a solution to this--it's not exactly elegant, though, because it requires some filename hacking:
Turns out if you have a reference to a stereo interleaved file in your project, and you replace it with a mono file of exactly the same length and filename, Logic will happily accept the substitution without a complaint. So the way to replace all the stereo files with the .L files is:
1) Copy the stereo interleaved files into split stereo, then remove the new split stereo files from the audio bin (but leave them on disk)
2) Close the project
3) Remove the original stereo files from the "Audio Files" folder, and delete the .R files.
...that's all easy... then...
4) Rename all those .L files, removing the .L so they have the same names as the original stereo files
5) Reopen your project--Logic will now refer to the new mono files, not the original stereo files
Step #4 requires some hacking to do efficiently: I used the command line to rename all those files quickly. There are probably utilities out there that could have done the job with a GUI, and AppleScript could probably do it, too.
Anyway... this works, if it's helpful to anyone else.
But ultimately I guess this is a feature request: it's cool that Logic makes it so easy to manipulate split stereo files as a single unit. But there are occasional times when you need to manipulate stereo files individually. There should be a track command in the arrange that takes a stereo track and replaces it with two mono tracks... rather surprising this doesn't seem to exist (it's one mouse click in ProTools [ducking])...
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Converting stereo to mono...how??

I have a file that has stereo audio, but only has audio in the right channel. I want to tell it to be mono. How can I do this in CS3?
TIA
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PS..I posted this in the 2x and earlier forum accidentally ....sorry if you see both posts

See also:
FAQ:How do I create mono/stereo out of stereo/mono audio?
Cheers
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How to convert MIDI to mono OR limit the spread across the speakers

I recorded a MIDI Piano piece for a song I'm working on and it is spread across both speakers, the lows in the left and the higher frequencies in the right, the middles in the middle. This is quite annoying for mixing, is there anyway I can limit this to a mono track or control how much it spreads across the speakers (ideally only where I want it to)?

Hi Glenn,
you are mixing apples with oranges!
The audio instrument track is MIDI not audio!
cheers
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Hi, Rob,
Yes, I realized that, but I still can't account for the little track meter registering something when I moved the Audio Instrument track over.
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Hi there,
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I see this was asked a few weeks ago but in case it's helpful, I'll reply.
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http://www.radioshack.com/product/index.jsp?productId=2102690
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Hi all,
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UODATE:
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The building will close here. So have to leave.
But I will try if I can change the settings of the masterclips from within an XML...
OR the solution would be in QT to split the two channels in two soundtracks in Quicktime... But how?
Rienk
Message was edited by: Rienk

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Windows XP
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Thank you for your posting, which is very helpful, however it will be better if you can post on the Video forum as well
http://discussions.apple.com/forum.jspa?forumID=807
By the way, I must say that it is a very good post

Switching from stereo to mono...

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How to convert stereo to mono?

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