Jokosher - Jokosher is a simple and powerful multi-track studio.
WaveShop - Open source audio editor
Fission - Edit audio in minutes, not hours.
TwistedWave - TwistedWave is one of the unique audio editors that allow you to edit your music file online without any installation.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
MusicBoard - Mb Launchpad is the first Linux launchpad.