Can someone recommend a good audio editing program for me?

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Here's the deal. I've got a number of karaoke audio files residing on my computer and I'd like to make a few MP3s for my SO for Valentine's Day with me singing. I assume it wouldn't be too difficult with the right software to combine the karaoke track with a track of me singing. Can anyone recommend a program that would allow me to do this that isn't terribly complicated?

I'm heading off on a 90 minute commute now and won't be back for a while, but I'll be back tonight and would greatly appreciate any advice offered. Thanks in advance.

[pokerfan]

1. Audacity

Audacity is a free software, cross-platform digital audio editor and recording application. It is available for Windows, Mac OS X, Linux and BSD.

http://en.wikipedia.org/wiki/Audacity
http://wiki.audacityteam.org/wiki/Audacity_Wiki_Home_Page

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2. Much thanks!

I'll give it a look when I get home.

[hobbit709]

3. +1 on Audacity

Been using it for years on my portable recording setup. M-Audio 1010LT 8 input/output on a LANbox machine.

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4. I checked it out last night.

Awesome that I didn't need to purchase something. This looks like it will do all I need it to. Thanks for the seconding.

[chrisa]

5. Awesome suggestion. Was thinking of this when I saw thread + before I clicked on it.

I use it to record audio as well.