Features:
Unlimited audio tracks and buses
Non-destructive, non-linear editing with unlimited undo
Anything-to-anywhere Signal routing
Unlimited pre- and post-fader plugins
32 bit floating point audio path
Automatic track delay compensation
Sample accurate automation
Standard file formats (BWF, WAV, WAV64, AIFF, CAF & more ...)
Full AudioUnit plugin support on OS X
More than 200 LADSPA & LV2 plugins freely available
Support for Windows VST plugins available
MIDI CC control with 1 click
Level 2 MIDI Machine Control
MIDI Timecode (MTC) Master or Slave
Full integration with all JACK applications
Video-synced Playback, pull up/pull down
No copy-protection
Distributed, world-wide development
Released under the GPL
Source code for everyone
Open XML session file format
On OS X, works with any CoreAudio supported audio hardware
On Linux, works with any ALSA/FFADO-supported audio hardware
Network audio (full fidelity over local network or long haul with CELT) via NetJack.