Key version 2.0 improvements include:
• "SoundMap" - Arturia's new preset navigation system.
• Lower CPU utilization on Mac OS X.
• Better Audio Unit compatibility (Digital Performer most notably).
• Ability to use NRPN MIDI messages for automation.
• Better handling of control surfaces while changing preset.
• Presets now respond to modulation wheel.
• Fresh batch of presets made by a selection of top sound designers.
• MIDI RPN "pitch bend range" message is now recognized.
• New Syncrosoft copy protection.
• Numerous bug fixes.
The upgrade is free for all registered users.
More info: http://www.arturia.com/evolution/en/products/arp2600v/intro.html