ACID crawled to a couple of new versions, but development had largely stalled. It was around this time that the original makers Sonic Foundry sold everything to Sony, and for the next decade or so, Sony seemed to put most of their effort into developing the Vegas Pro video editing software that had emerged from ACID in 1999. ACID, meanwhile, slowly acquired the vital bits and pieces it needed to call itself a DAW, and by version 4 in 2003 had MIDI sequencing, automation, VST plug-ins, surround–sound mixing and video support.
The ability to pitch-shift audio and time-stretch loops to fit a given tempo is a standard feature and one for which Ableton Live was invented. This looping technique has been adopted by pretty much every audio production program since. Armed with a sample CD of 'Acidized' loops, you could paint them onto a timeline and pull together arrangements at great speed. Loops in ACID contained tempo and key information that allowed them to be matched automatically when used in the same project. When it first appeared in the late '90s, ACID's extraordinary ability to manipulate the pitch and tempo of looped audio created a whole genre of computer-based loop sequencing that had previously been the realm of scratch DJs and hardware samplers. ACID Pro is the original loop-based remixing program, and the Next version opens up new possibilities thanks to the intriguing Stem Maker.
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