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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 ==
Rob's personal definition of a modular synthesizer is more to do with modulation than modularity; referring to functional modules as 'sections'. Everything is supposed to be able to modulate or effect everything else. All levels within the system are optomised for comparability with one another.<ref name=":2" />▼
=== Ergonomics ===
=== Chaos ===
▲Rob's personal definition of a modular synthesizer is more to do with modulation than modularity; referring to functional modules as 'sections'. Everything is supposed to be able to modulate or effect everything else. All levels within the system are optomised for comparability with one another.<ref name=":2" />
Functionality-wise Rob also draws heavy inspiration from chaos theory which he studied in the 80s reminiscing, "in those days it was more about graphic functions and little pictures but I was curious about how to apply them to music." After some disappointing experiments he learned a couple of tricks that produce musical results.<ref name=":2" />
Making a strong distinction between chaotic and 'random' behavior, Rob emphasises the way a disturbed chaotic system tends to seek stability, or a number of balanced states called 'strange attractors'; These balanced states can produce patterns, and when the patterns are short enough to be recognised can produce very musical results. He believes using these methods is the best way to breathe a kind of life or personality into electronic instruments.<ref name=":2" />
▲This design philosophy extends behind the face-plates too, where consideration for ease-of-construction is just as important. With few exceptions, all Hordijk modules consist of 8 pots and 10 jacks. This allows for two underlying PCBs, one for mounting all the interface components, and another for the underlying module functions.<ref name=":2" /> In response to a question about whether this rigid format becomes limiting Rob responded: <blockquote>"It is often a good idea if you design something to impose a certain limitation upon yourself. Basically the way I design is at first I go wild, and go complex, until I feel that I've hit some good stuff, and then I simplify. And this process of simplification is quite important because maybe I have a design that could have like 14 knobs and 18 connectors, and then by simplifying it back to 8 knobs and 10 connectors with the most important functions that actually tends to add strength to the design."<ref name=":2" /></blockquote>Functionality-wise Rob also draws heavy inspiration from Chaos theory believing greatly in the ability for chaotic - as opposed to 'random' - systems to produce musical results.
== Workshops and Lectures ==
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As everything is hand built there can be minor cosmetic issues like dustmarks anodized into a frontpanel or some lettering slightly out of focus, basically the usual things that are simply unavoidable with handwork. All electronics however are thoroughly tested and burnt in for several days before a system leaves the workshop. Only high quality precision components are used for the electronics and all pots are of the 'conductive plastic' type that will never develop crackles in the sound and easily last ten times as long as the more common carbon pots. Everything is designed to last a musicians lifetime and first time owners have unlimited warranty on parts and repairs.<ref name="rh" />
=== 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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The power supply used is a Meanwell RD-3513 set to +/-15V. It accepts an input voltage between 100VAC to 240VAC, meaning it can be plugged into a wall anywhere in the world. One PSU can safely supply current to four triples, for a bigger system a second PSU is recommended.<ref name="rh" />[[File:Hordijk Modular.jpeg|alt=A Rob Hordijk Original Design Modular System|thumb|A Rob Hordijk Original Design modular system, showing four triple-panels in a complete case.]]
=== Modules ===
Modules came with various combinations of the following single functions, though some smaller functions were combined; for example the PHASER and FREQ SHIFTER have appeared in both dual and combination formats.
* [[Rob Hordijk Triple LF-VCO|TRIPLE LF-VCO]]
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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 ==
*[[Rob Hordijk Blippoo Box|Blippoo Box]] "A patch in a box" - Rob<ref name=":2" />
* [[Rob Hordijk Benjolin|Benjolin]], "Bent by design" / "My gift to the DIY community" - Rob<ref name=":2" />
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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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