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I have an m4a file. When listening to it on my iPod Touch, the volume is too low, even when I turn it all the way up.

I need to increase the volume in the file so that I can hear what is being said.

Also, in the background it sounds like there is a hissing sound that I'd like to get rid of.

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I'm assuming you mean m4v, not "m4b"? – Nate Koppenhaver Nov 27 '11 at 20:45
    
try audacity. – gadgetmo Jan 30 '12 at 19:11

I'd use mp3gain or AACGAIN for that. The former's GUI works with AACGAIN too, but AACGAIN is the app for m4as.

It'll let you batch modify the volume of files to a certain level without loss of quality.

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From looking at the web page for mp3gain, it looks like it's for averaging the volume of a set of MP3 files. Can it adjust the volume of a single file? – Marc Stober Mar 3 at 12:09

You need to look at "Auto Volume Levelling". This is done on your PC/MAC.

This page has instructions for iTunes as well as other music apps.

Though if you've got a background hiss already, this could get louder too. You'd need to look at some more serious filtering software for that.

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