many programs and devices have a function that slows down or speeds up audio without changing the pitch. my rockheaded layman's theory on illustrating how this must be done is that it divides the whole audio track into something like audio pixels that are so short that they can be shortened without actually removing any of the details that you're hearing-- it's just you're hearing every small detail for less of an amount of time (likewise with slower speed, it lengthens the amount of time that you hear every of those little "audio pixels" so that it is twice as slow). [more inside]
posted by candyhammer on May 28, 2009 - 13 answers

I have many wav files that I need to modify in the same way. Specifically, I want to fade in from zero dB for the first 5 ms and fade out to zero db for the last 5 ms. What do I use? [more inside]
posted by pealco on Feb 25, 2009 - 7 answers

I have a WAV file of a lecture I'm trying to edit into a Podcast using Audacity. There's some feedback and ringing during some of the speaker's talk. How do I get rid of it (or at least minimize it)? [more inside]
posted by dw on Oct 30, 2006 - 13 answers

Is there any way to normalize audio within iMovie? A plugin or something? [more inside]
posted by Tlogmer on Jul 28, 2006 - 1 answer