Eventide, Inc. (also known earlier as Eventide Clock Works Inc., or today simply Eventide) is an audio and broadcast, communications, and avionics company in the United States whose audio division manufactures digital audio processors and DSP software, and guitar effects. Eventide was one of the first companies to manufacture digital audio processors, and its products are mainstays in Sound recording and reproduction, post production, and broadcast studios.

Eventide was founded by recording engineer Stephen Katz, inventor Richard Factor, and businessman/patent attorney Orville Greene. The business was founded in the basement of the Sound Exchange, a recording studio located at 265 West 54th Street in New York and owned by Greene. When Katz needed to rewind the analog tape back to a specific point on their Ampex MM1000 multitrack recorder, but limited space in the studio did not allow for a "tape op" device, Katz asked Factor to build a gadget that would do the job, and the resulting device turned into an Original equipment manufacturer (OEM) success for Ampex. Other early products included a two-second delay for telephone research and an electrostatic deflector for dispensing nanoliter quantities of chemical reagents.

Eventide's original product line consisted of two products: the Instant Phaser (the result of an AES Show appearance) and what would become the 1745 Digital Delay Line (the result of a significant order from Maryland Public Broadcasting).

1745 Digital Delay Line - 2-channels of independent delay from a single input, with the delays ranging from 0 to 200 milliseconds.
1745A Digital Delay Line - Modification of 1745 DDL with easier, more user-friendly shift registers.
1745M - Another variant of the original 1745M, this version was one of the first uses of Random Access Memory (RAM) in an audio product, and also had an optional pitch change module, one of the first products of this kind with a frequency response suitable for music.
H910 Harmonizer® (1975) - First commercially available pitch changer.
H949 Harmonizer® - Harmonizer with finely controllable pitch change capability, used for "doubling" vocals, and "deglitch" option for greatly reducing objectionable artifacts in harmonized audio.
BD955 (1975) - "Obscenity Delay" allowed broadcasters sufficient delay to delete any objectionable content (like from a live telephone caller on a radio show) with no apparent interruption to the program
SP2016 - Early Digital Reverb processor utilizing DSP and first effects device to publish its SDK so that 3rd party developers could develop "plug-in" algorithms
Instant Phaser™ - The first phaser
Instant Flanger™ - One of the first flangers
H3000 (1986) - First intelligent/diatonic pitch shifting.
DSP4000 (1994) - User-programmable algorithms with a large toolkit of DSP functions
DSP4000B, DSP4000B+ - Series of processors with algorithms written for broadcast and film production, by sound designer Jay Rose.
DSP4500 (1998) - Similar to DSP4000 with the addition of sampling
DSP7000 (2001) - Pitch shifter / effects processor with four times more processing power than the DSP4000 series
DSP7500 (2001) - Similar to DSP7000 with the addition of sampling
Orville (2001) - Pitch shifter / effects processor with twice the processing power of the DSP7000 / DSP7500 processors and up to 8 channels
Eclipse (2002)
Clockworks Legacy (2003) - Software plug-in versions of classic Eventide effects and DSP
BD500 (2004) - 40-second version of Eventide's fourth-generation broadcast profanity delay
Anthology TDM Bundle (2005)
H8000FW (2005) - Successor to Orville with increased processing power
H7600 (2006) - Successor to the DSP7000 series with increased processing power