Features:
- Elegant single-window work environment.
- Powerful drag-and-drop functionality.
- Unlimited audio tracks, MIDI tracks, virtual instruments, buses and FX channels.
- Content browser with convenient sort options and preview player.
- Integrated mastering solution with automatic mix updating, waveform editing, effects, Red Book CD burning, and digital release.
- Automatic delay compensation.
- Advanced automation.
- 64-bit processing (even on 32-bit machines).
- Easy-to-use sidechain routing.
- 64-bit effects suite.
- Virtual instruments collection.
- User-friendly sampler.
- Intuitive MIDI-mapping system.
- Real-time audio timestretching and resampling.
- AU, VST2, VST3, and ReWire support.
- K System metering.
- Compatible with any ASIO-, Windows Audio-,or Core Audio-compliant audio interface.

Studio One 2.6.5 Release Notes
Studio One 2.6.5 has the following new features and enhancements:
- SoundCloud client to support new API

Studio One 2.6.5 fixes the following issues:
- [OSX] Save As dialog path is the folder again

NOTE:
For the people who want to use stable version.