ACID Pro

ACID Pro is a professional digital audio workstation (DAW) software program. It was originally called "ACID pH1" and published by Sonic Foundry, which was later merged into Sony to create Sony Creative Software.

ACID Pro uses Acid Loops (meaning they contain tempo and key information for proper pitch transposition) painted out across the screen to create music tracks. Acidized loop sample CDs are available from Sony, as well as third party companies.

As with most sophisticated software packages, ACID is not a single software product but defines a family of products spanning a significant range of features. In a related-marketing effort, Sony has continued to support ACIDplanet, a content web site originally launched by Sonic Foundry which is aimed at current ACID users, prospective ACID users and the general public. It describes itself as "the Internet's premier site for music, video and unique artists".

On May 20, 2016 Sony announced that they would be selling the bulk of their creative software suite, including ACID Pro, to Magix GmbH & Co.

ACID Loops is a technology used with the music making software originally from Sonic Foundry called ACID. Created in 1998, it refers to the repetition, and transposition of sound clips, to form a song. The ACID Pro program is now owned and distributed by Sony, and is on version 7. Sony also now sells a line of Acidized loop sample cds to be used with ACID, as do many third party companies.

Similar technology was added to Cakewalk's Sonar (calling it "Groove Clips") and Cubase (calling it Audio Warp). Although the phrase "acid loops" technically is only associated with Sonic Foundry, some people use the term to refer to the technique even when used with other software packages.

Acidized loops contain tempo and key information, so that ACID can properly time stretch them when pitch shifted.

A website for budding musicians using ACID technology was set up, named ACID Planet.

ACID was first launched in 1998 as a loop-based music sequencer, where someone could simply drag-and-drop an Acid loop file (for example a drum or bass loop) onto a track in Acid, and that loop would automatically adjust itself to the tempo and key of the song, with virtually no sonic degradation.