Ardour is a digital audio workstation with a long list of features. You can use it as a multichannel hard disk recorder or a mixer with unlimited busses, tracks, and plugins, and you can control it from your keyboard/mouse or a MIDI Machine Control board. It will handle as many physical inputs and outputs as you have installed on your system.
Ardour is under active development (including a Google summer of code project) and has a vibrant user community at the upstream website.
If you're looking for an interactive tool for just about any sound project -- from making a CD to adding sound effects to a video track -- and you're willing to invest a bit of time into learning to use a powerful tool, Ardour is for you.
Installing from the command line: yum install ardour Installing using the graphical installer: Applications > Sound & Video > ardour Menu location after installation: Applications > Sound & Video > Ardour Command: /usr/bin/ardour Upstream website:http://ardour.org/