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Sound Tools was a digital audio workstation released by Digidesign in 1989. Its successor, Pro Tools, is the current industry standard in music production and TV/film audio post production.
It consisted of a NuBus DSP Card (Sound Accelerator II), Digital Interface (DAT I/O), Analog Interface (AD In) and software (Sound Designer II). It was later replaced by Sound Tools II, which utilized an improved DSP Card (Sound Accelerator II/2) and Interface (442 I/O, same as used in the original Pro Tools system).
It provided mono or stereo recording/editing/playback, as well as DSP effects like EQ, Gain Change, and noise reduction. It was initially made for the Macintosh platform with an Atari version available later.