Main features of ACID Pro Next and ACID Pro 9 at a glance:

Exclusive in ACID Pro Next: zynaptiq source separation technology
Exclusive in ACID Pro Next: Celemony Melodyne Essential
Exclusive in ACID Pro Next: All-new mastering tools
MIDI Playable Chopper
All-new ACIDized loops
Dozens of instruments and effects
32-bit VST Bridge

なんだこのACID Pro Nextって・・