The information in the article applies to:

• SONAR 4 Producer Edition 
• SONAR 4 Studio Edition

SONAR 4 has Several new features.

• Surround Mixing (SONAR Producer only)
• Surround Bridge (Surround Effects Linker) (SONAR Producer only)
• Joystick Support (SONAR Producer only)
• Lexicon Pantheon Surround Reverb (SONAR Producer only)
• Sonitus Surround Compressor (SONAR Producer only)
• Video Thumbnail Track (SONAR Producer only)
• Track Folders 
• Freeze Synth or Tracks
• Loop Construction View Enhancements 
• Bus-able Audio Metronome
• Group Editing (Multi Clip Slip-Editing, Fades and Spits)
• Take Management and Comping Enhancements
• Track Layers 
• Powerful crossfade tool for cropping overlapping clips
• Mute Tool-Clip-based(Clip Mute) or time-based within a clip, and Isolating (Clip Soloing)
• Video Export to Quick Time, Windows Media Video, and AVI
• Enhanced Key Bindings 
• Nudging
• Navigator View
• Audition (Selection Playback)
• Cakewalk TTS-1 Dxi Synth 
• POW-r Dithering (SONAR Producer only)
• Prosoniq MPEX Time Scaling (SONAR Producer only)
• Configurable RMS and Peak Meter Ballistics
• Six Stereo panning laws 
• Powerful presets for frequently used export settings
• Export buses and tracks into a composite mixdown, or as individual files 
• WMA9, 5.1 WMA9 Pro, and WMA9 Lossless Encoding 
• Open support for external command-line encoders
• Color Enhancements (Console view and clips)  

Please see the NEW Features in SONAR 4 section in the online Help for more information. You can access this help topic from Help-What's New.