I am not ready to record yet, but I have edited tracks togehter using Audacity. Audacity is free, cross platform, open source software. it is powerful, but relatively easy to use software. As a linux geek, I have tried a few other programs. If you have some experience as an audio engineer, You might give Ardour a look. Ardour is also free and cross platform, but to get the most out of it, you will need some engineer's chops. It is very powerful but the user interface is geared toward an audio professional.