http://mediasoftware.sonypictures.com/products/showproduct.asp?pid=928

LITERAL:
ACID® Pro software is the ideal loop-based music composition and production tool for original music creation. Revolutionary since the first version, the tradition of innovation continues with version 5. Powerful new features and advanced functionality make ACID Pro 5 the most comprehensive application of its kind. ACID Pro software is the tool of choice for millions of industry professionals who want to create songs, remix tracks, produce 5.1 surround audio mixes, develop music beds, score videos, and much more. ACID software is ideal for real-time pitch-shifting, time-stretching, and groove quantization of audio and MIDI events. With new technologies and advanced professional features, ACID software provides the most powerful, user-friendly environment for everything from basic song creation to complex video scoring.