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[[File:Hordijk-1.jpg|thumb|Rob posing with one of his modular systems. ]]
'''Rob Hordijk Original Design''' are the [[West Coast|"Dutch West Coast"]]<ref name=":2">[https://www.youtube.com/watch?v=uyEwdrLUa28 Episode 205: Rob Hordijk (2017)] Art + Music + Technology Podcast</ref> style [[5U|5U (Moog Unit)]] modules designed and crafted by Rob Hordijk; based in The Hague, Netherlands. Except for the [[Rob Hordijk Benjolin|Benjolin]], the designs are not available for DIY.
As Rob has never had a product website for his instruments, the source for much of the information about them comes from direct contact via email - cited directly as ''Rob Hordijk'' <ref name="rh" />
== Biography ==
Born in 1958, self described "synthesizer designer and builder,<ref name=":0">Rob Hordijk Presentation & Synth Tutorial // Modular Meets Leeds 2017 https://www.youtube.com/watch?v=GzW6pTzATG4</ref>" Rob Hordijk began learning electronics from around age 12 after developing a fascination with the glowing tubes in stereo amplifiers.<ref name=":2" /><ref>[http://vimeo.com/107453197 The Designer] by Franz Schuier, 2008</ref> When he was 14 his father who had noticed young Rob's interest gave him a subscription to an electronics course, which lead to an examination for a ham radio license.
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Trained as a designer and not a musician, Rob came from an arts background, studying as a sculptor and jeweler in the 1970s. He approached electronic music in a similar spirit to abstract painting, inspired by the ambient works of Brian Eno, and Luigi Russolo's Intonarumori instruments; where attempts were made to blur the boundaries between music and art:<ref name=":2" /><blockquote>"In those days I was quite interested in the idea of sound as a material to be sculpted, in the same way you can sculpt wood and metal. [...] You can make mechanical objects that make all sorts of sounds, or you can make electronic objects that make all sorts of sounds. but what I like about the electronic objects is that you don't see what makes the sound. [...] It opens the way to sort of make it a bit mysterious."<ref name=":2" /></blockquote>In the early 1980s as various integrated circuits, micro-controllers, and processors became available to hobbyists, Rob began buying things such as the early Curtis chips and RCA 1802 based [http://www.old-computers.com/museum/computer.asp?st=1&c=908http://www.old-computers.com/museum/computer.asp?st=1&c=908 SuperElf] processor board out of curiosity more than professional ambition.<ref name=":2" /><ref name=":1" /> Later switching to an Apple ][+ and the Mountain Hardware Music System, for which he developed a Forth language version that could do all sorts of stuff with the Mountain cards, like [https://en.wikipedia.org/wiki/Karplus%E2%80%93Strong_string_synthesis KarplusStrong-type] plucked string sounds and pitch shifting.<ref name=":1" /> His first introduction to a [[DSP]] was to the DMX1000 around 1984. In 1986 he switched to Atari ST and an Akai S900.<ref name=":1" /> These days he is a [http://www.soundonsound.com/sos/jul04/articles/nord.htm Clavia Nord Modular G2] aficionado.<ref name=":1">[http://electro-music.com/forum/post-10645.html&highlight=#10645 Hello to you all], electro-music.com forum, 29 March 2004</ref><blockquote>"I am not really a gear freak. But I do believe in mastering synthesis techniques, in making synthesis a second nature, so to be able to fully concentrate on the creative processes."<ref name=":1" /></blockquote>After finishing art school, Rob also completed 11 years of study in Information Technology, learning about design methods and inventory control.<ref name=":2" />
As well as his own instruments Rob worked on the Nord Modular G2 including contributing many patches to the Nord Modular online community, and wrote a [https://rhordijk.home.xs4all.nl/ comprehensive unofficial manual] of the instrument. He has produced music for environments, buildings, film, and dance performances, but is yet to produce an official release on a label.<ref name=":1" /> As of 2022 Rob has announced his retirement and will no longer be taking orders.<ref>Mod Wiggler forum: [https://modwiggler.com/forum/viewtopic.php?t=70363&start=2600 Hello Hordijk] </ref>[[File:Evening session modular serge hordijk.jpg|alt=A Rob Hordijk Original Design modular synthesizer (left) with other instruments.|thumb|A Rob Hordijk Original Design modular synthesizer (left) with other instruments. ]]
== Design Philosophy ==
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=== Format and Power ===
Rob's modules conform to the [[5U]] [[MU parts|(Moog Unit)]] (222mm / 8.75") standard. Single modules were produced 2U wide, which Rob later refined into a triple-module 6U (325mm / 12.79") wide standard.<ref name="rh" /> A frame holds the modules in a way that it becomes one solid block. A frame can easily be mounted in a DIY cabinet made of just four shelves, it is fixed in a cabinet with a set of woodscrews from within the frame into the side shelves. Frames can be made up to three triples in width (976 mm wide) and basically any number of rows in height (225 mm per row). The most popular frame is two rows of two triples and measures 651 mm in width and 451 mm in height.<ref name="rh" />
The plywood flightcases have their power entry either on the left side or on the right side of the case. This should be specified when ordering. The lightweight flightcase has its power entry on the front and for this it needs the TriLFO-Matrix6x4-Nodeproc-MIDI-IECinlet triple or the Rungler-Matrix6x4-Nodeproc-MIDI-IECinlet triple. It lacks the +/-15V MiniXLR power outlet that is available on the other MIDI triples. The MiniXLR might be used for future expansions, to power e.g. a Blippoobox or for powering DIY projects. It should be considered just a convenience if ever needed and not a necessity.<ref name="rh" />
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* [[Rob Hordijk Triple-Input 24dB Filter|24dB FILTER]]
* [[Rob Hordijk Twinpeak|TWINPEAK]]
* [[Rob Hordijk Active Matrix|
* [[Rob Hordijk Dual Fader|FADER]]
* [[Rob Hordijk Dual Phaser|PHASER]]
* [[Rob Hordijk ShaperPhaser|SHAPER]]
* [[Rob Hordijk Node Processor|NODE PROC / MINI MATRIX]]
* MINI MATRIX
== Other Instruments ==
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* [https://www.modwiggler.com/forum/viewtopic.php?t=32700 Rob Hordijk 24dB MultiMode Filter demos], Mod Wiggler forum, Apr. 2011
* [http://vimeo.com/107453197 The Designer] by Franz Schuier, 2008
* [https://electronicmusic.fandom.com/wiki/Rob_Hordijk_Design Rob Hordijk Design] on https://electronicmusic.fandom.com/
=== Pre-built Eurorack Modules ===
* [https://web.archive.org/web/20141019122935/http://www.epochmodular.net/benjolin.html Benjolin], Epoch Modular
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