Ardour

Ardour is an open-source, collaborative effort of a worldwide team including musicians, programmers, and professional recording engineers. Grab yourself a nice audio interface. Plug in a microphone or a keyboard. Add a track. Press record. Cut, move, stretch, copy, paste, delete, align, trim, crossfade, rename, snapshot, zoom, transpose, quantize, swing, drag, drop. Mute, solo, fader, automate, EQ, dynamics, insert, send, pre-fader, post-fader, sync, monitor, isolate.