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Eventide Inc.
Type Private
Headquarters Little Ferry, New Jersey
Key people
Richard Factor, Co-founder and Chairman
Orville Greene, Co-founder
Steve Katz, Co-founder
Anthony Agnello, Managing Director
Richard Van Tieghem, President, Communications Division
ProductsPro audio and Communications equipment and software
Eventide DDL 1745 Digital Delay Line Studio Processor

Eventide, Inc. (also known earlier as Eventide Clock Works Inc.) is an American audio, broadcast and communications company whose audio division manufactures digital audio processors, digital signal processor (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. [1]

Eventide Instant Phaser
Eventide Instant Phaser


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 City 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 (a person who would operate the tape recorder on behalf of the sound engineer), 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. [2]

Eventide's original product line consisted of two products: the Instant Phaser [3] (the result of an Audio Engineering Society Show appearance and Eventide's first answer to tape-based flanging), and what would become the 1745 Digital Delay Line [4] (the result of a significant order from Maryland Public Broadcasting and the world's first digital pro audio device).

Eventide Instant Flanger

Beginning with the 1745M, Eventide began widely using random-access memory (RAM) chips in many of their products. After purchasing a Hewlett-Packard computer for researching reverb algorithms and needing to upgrade the memory in order for the computer to handle the necessary complex computations, Eventide designers realized that they could manufacture computer memory expansion far more affordably than the current market price. Therefore, Eventide began to manufacture and sell HP-compatible RAM expansion boards and did so from the late 1970s to the mid-1990s. [5]

In 2017, Richard Factor was interviewed about Eventide's history on the Gear Club podcast in episodes 6 [6] and 7. [7]


Shortly after Eventide moved its offices from Manhattan to New Jersey, its President earned a private airplane pilot's license. Surprised that moving map displays were not available for small airplanes, he had Eventide develop Argus, the first moving map system, and one of the first multi-function displays designed for general aviation use. [8]

Digital voice logging and recording

NexLog DX-Series Recorder

In the early 1990s, Eventide developed digital voice logging recorders that enabled broadcasters, police, 911 centers and utilities to begin archiving digitally with improved audio quality and far greater storage capabilities than they previously had been working with. Eventide’s early recorder models (VR240, VR320, DiR-911T, VR615, VR725 and VR778) were installed worldwide.

In 2012, Eventide introduced its “NexLog” Communications Recorders for P25, NG911, public safety, utilities, and air traffic control facilities. These mission-critical recording systems capture, store, protect, reproduce, and manage important multimedia interactions and critical data.

In 2020, Eventide introduced its “NexLog DX-Series” Communications Recording Solutions, which added support for virtualization, increased the maximum channel capacity to 540 per unit, and added full HTML5-based monitoring and replay of voice, PC screens, imagery, video and data.

H910 Harmonizer

H910 Harmonizer

The Eventide H910 Harmonizer [9] was first demonstrated to universally positive reactions at the AES show in late 1974. It was designed by Eventide's first engineer, Tony Agnello (who went on to become the president of Eventide's audio division). The pre-production prototype was a hand-wired box topped with a music keyboard controller (which was developed into the HK 941). Jon Anderson of the band Yes was among those impressed and became a tester for the first prototype. The production H910 was released in 1975, offering pitch shifting (±1 octave), delay (up to 112.5 ms), feedback regeneration and other features in an easy-to-use box that sold for $1,600. The H910 model number refers to the Beatles song " One After 909".[ citation needed]

The first H910 customer was New York City's Channel 5, utilizing it to downward pitch shift I Love Lucy reruns that were sped up to create room to run more advertisements. Speeding up the reruns had increased the pitch of the audio, and the H910 was able to shift that pitch back to where it originally had been. Frank Zappa and Jimmy Page added it to their guitar processing rigs. Producer Tony Visconti used the H910 to create the snare sound on David Bowie's album Low (1977), as did Tony Platt on AC/DC's song " Back in Black" (1980). Chuck Hammer in 1979 used it as an integral part of his Guitar Synth rig on tour with Lou Reed and in 1980 with David Bowie. Another popular application was to use two H910s slightly detuned with a small delay. Notable users of this twin Harmonizer effect included Eddie Van Halen, who used it for his trademark guitar sound, and Tom Lord-Alge, who used it for the vocals on the hit Steve Winwood song " Back in the High Life Again" (1986). Recognizing the popularity of this application, Eventide later recreated it as the "Dual 910" program in the H3000 UltraHarmonizer released in the late 1980s. The H910 was also one of Eventide's first devices to enter the world of film, and was used on the voice of R2-D2 in Star Wars.

The H910 Harmonizer was recognized by the AES with a TECnology Hall of Fame award in 2007. [10] On November 10, 1976, Eventide filed a trademark registration for "Harmonizer" and continues to maintain its rights to the Harmonizer trademark today. [11]

Timeline of noteworthy products

Eventide H9000 Harmonizer Effects Processor
Eventide Space Reverb & Beyond Stompbox
  • PS 101 Instant Phaser (1971) - The first studio phaser, and pro audio's first rack mount effects unit. Used on classic songs such as Led Zeppelin's " Kashmir." Used analog all-pass filters to phase shift.
  • 1745 Digital Delay Line (1971) - First digital pro audio device. Two channels of independent delay from a single input, with the delays ranging from 0 to 200 milliseconds. First used at the 1973 Summer Jam at Watkins Glen. [12] Inducted into the TECnology Hall of Fame in 2018. [13]
  • DDL 1745A (1973) [14] - Modification of 1745 DDL with easier with more user-friendly shift registers
  • Omnipressor (1974) [15] - First dynamics effects processor with a wide range of functions beyond compression and limiting as they were known. Innovated dynamic reversal and infinite compression, and was the first device to implement side-chain compression.
  • DDL 1745M (1975) [16] - Another variant of the original 1745, replacing shift registers with Random Access Memory (RAM) which allowed for finer resolution delay. This version was one of the first uses of 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.
  • Instant Flanger (1975) [17] - One of the first pro audio flanger devices to authentically simulate tape flanging. Used bucket brigade chips to achieve the short delays necessary for flanging.
  • H910 Harmonizer(1975) [18] - First commercially available pitch changer and first digital multi-effects processor.
  • BD955 (1977) - "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. It was the successor to a custom 1 1/4 second delay built for WPLJ NY 95.5 which was the first electronic delay for broadcast. Later ABC also commissioned a five-minute custom delay used to delay the radio network news.
  • H949 Harmonizer (1979) - Harmonizer with finely controllable pitch change capability. Used for "doubling" vocals and had "de-glitch" option for greatly reducing objectionable artifacts in harmonized audio.
  • SP2016 (1982) [19] - Early Digital Reverb processor utilizing DSP and first effects device to publish its SDK so that 3rd party developers could develop "plug-in" algorithms.
  • H3000 (1986) [20] - First intelligent/diatonic pitch shifting. Used the 16-bit TMS320 DSP chip.
  • DSP4000 (1994) - User-programmable algorithms with a large toolkit of DSP functions
  • DSP4000B, DSP4000B+ [21] - Series of processors with algorithms written for broadcast and film production, by sound designer Jay Rose.
  • DSP4500 (1998) [22] - Similar to DSP4000 with the addition of sampling
  • DSP7000 (2001) [23] - 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) [24] - Pitch shifter / effects processor with twice the processing power of the DSP7000 / DSP7500 processors [25] [26] and up to 8 channels
  • Eclipse (2002) [27] [28] [29] - First Eventide effects processor to come in single rackspace unit
  • Clockworks Legacy (2003) [30] - Software plug-in versions of classic Eventide effects and DSP
  • BD500 (2004) [31] - 40-second version of Eventide's fourth-generation broadcast profanity delay
Eventide H9 Max Harmonizer Multi Effects Pedal
  • Anthology TDM Bundle (2005) [32]
  • H8000FW (2005) [33] - Successor to Orville with increased processing power
  • H7600 (2006) [34] - Successor to the DSP7000 series with increased processing power
  • Stompbox Line (2007) [35] - TimeFactor, ModFactor, Pitchfactor, Space, H9, Powerfactor
  • H9000 Network Effects Platform [20] - Modular ARM based DSP design.

See also


  1. ^ Sound On Sound, "Astral Tweaks: Eventide Eclipse Multi-effects," Sep 2001,
  2. ^ "About Us".
  3. ^ "50th Flashback #1: The PS101 Instant Phaser". 19 January 2021. Retrieved 5 May 2021.
  4. ^ "50th Flashback #2.1: The DDL 1745 Delay". 11 February 2021. Retrieved 5 May 2021.
  5. ^ "History - Eventide". Retrieved 9 February 2019.
  6. ^ "Episode VI: Return of the Jedi, Richard Factor". Gear Club Podcast. Retrieved 2017-07-24.
  7. ^ "Episode 7: The Early Years of Eventide - Richard Factor pt. 2". Gear Club Podcast. Retrieved 2017-07-24.
  8. ^ "Outlook: High Hopes for General Aviation". Avionics. 1 January 2001. Retrieved 9 February 2019.
  9. ^ "50th Flashback #4.1: The H910 Harmonizer®". 20 April 2021. Retrieved 5 May 2021.
  10. ^ "TECnology Hall of Fame 2007".
  11. ^ Trademark for Harmonizer,
  12. ^ Nalia Sanchez (2020). "Remembering the Watkins Glen Festival". Eventide. Retrieved February 20, 2020.
  13. ^ "Eventide DDL 1745 Inducted into TECnology Hall of Fame". Mix Online. 9 February 2018. Retrieved 17 May 2021.
  14. ^ "50th Flashback #2.2: The DDL 1745A Delay". 16 February 2021.
  15. ^ "50th Flashback #3: The Omnipressor®". 10 March 2021.
  16. ^ "50th Flashback #2.3: The DDL 1745M Delay". 25 February 2021.
  17. ^ "50th Flashback #5: FL 201 Instant Flanger". Eventide Audio. Retrieved 19 May 2021.
  18. ^ "50th Flashback #4.2: H910 Harmonizer® — the Product". 23 April 2021.
  19. ^ "SP 2016 | Eventide". Archived from the original on 2019-07-22.
  20. ^ a b "Innovations: Eventide H9000 Network Effects Platform". 21 August 2019.
  21. ^ "DSP 4000B+". Gear Space. Retrieved 20 May 2021.
  22. ^ "Eventide DSP4500 Ultra-Harmoniser/Multi-Effects Processor" Sound On Sound, Nov 1998, Hugh Robjohns
  23. ^ "Review Eventide DSP7000 Series". Retrieved 10 May 2021.
  24. ^ "2001 review in "Pro Sound News"". April 2001. Retrieved 10 May 2021.
  25. ^ "Eventide H7600? - Page 2 - Gearslutz". Retrieved 9 February 2019.
  26. ^ "Eventide Audio & Communications". Retrieved 9 February 2019.
  27. ^ "Review Eventide Eclipse-". Retrieved 10 May 2021.
  28. ^ "Eventide Eclipse". June 2002.
  29. ^ "EVENTIDE Eclipse Effects Processor". April 2002.
  30. ^ "Eventide Clockworks Legacy".
  31. ^ "Mix Online, NAB 2004: Eventide BD500, Apr 2004". 16 April 2004. Retrieved 9 May 2021.
  32. ^ "Eventide Introduces Anthology TDM Bundle". 10 February 2005.
  33. ^ ""Eventide H8000FW" Mix Online, Nov 2005". Archived from the original on 29 June 2011. Retrieved 9 February 2019.
  34. ^ "NAMM06: Eventide Unveil Latest Ultra-Harmonizer". Sonicstate. Retrieved 9 February 2019.
  35. ^ ""Eventide Stompbox Line" Mix Online, Jan 2007". Archived from the original on 29 June 2011. Retrieved 9 February 2019.

External links