ACID is a music production tool that provides musicians with loop-arranging, editing, and CD burning.
ACID lets you bring in your own audio samples or work with hundreds of loops available from ACID. You can preview any loop before adding it to your mix, automatically matching the tempo and key in real time. ACID allows real-time changes to pitch and tempo to unlimited tracks and you can control the volume, pan, and effect envelopes for each track to create a perfect mix between loops. Processed audio can be directly output as WAV, MP3, RM or WMA format or exported as digital audio tracks.
It comes with the Sound Forge program.
This newest release offers fast "track-at-once" CD burning, mix tweaking with an "XFX" DirectX audio plugin, and support for saving files as MP3, RM or WMA format.
Limitations in downloadable version:
Playback is limited to one minute at a time and the session time limit is 15 minutes.