Sound Tools was a digital audio workstation

Digital audio workstation

A digital audio workstation is an electronic system designed solely or primarily for recording, editing and playing back digital audio. DAWs were originally tape-less, microprocessor-based systems such as the Synclavier and Fairlight CMI...

 released by Digidesign

Digidesign

Avid Audio is an American digital audio technology company. It was founded in 1984 by Peter Gotcher and Evan Brooks. The company began as a project to raise money for the founders' band, selling EPROM chips for drum machines. It is a subsidiary of Avid Technology, and during 2010 the Digidesign...

 in the late 1980s. Its successor, Pro Tools

Pro Tools

Pro Tools is a digital audio workstation platform for Microsoft Windows and Mac OS X operating systems, developed and manufactured by Avid Technology. It is widely used by professionals throughout the audio industries for recording and editing in music production, film scoring, film, and television...

, is the current industry standard in music production and TV/film audio post production.

It consisted of a NuBus

NuBus

NuBus is a 32-bit parallel computer bus, originally developed at MIT as a part of the NuMachine workstation project. The first complete implementation of the NuBus and the NuMachine was done by Western Digital for their NuMachine, and for the Lisp Machines Inc. LMI-Lambda. The NuBus was later...

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.