https://proaudioaccessories.com Tue, 05 May 2026 06:04:49 +0000 en-US hourly 1 https://wordpress.org/?v=4.1.1 https://proaudioaccessories.com/2024/02/benjolin-by-rob-hordijk-eurorack/ https://proaudioaccessories.com/2024/02/benjolin-by-rob-hordijk-eurorack/#comments Sat, 10 Feb 2024 23:37:43 +0000 https://proaudioaccessories.com/2024/02/benjolin-by-rob-hordijk-eurorack/



Grab yourself one of these rare, weird and wonderful beasts! The Benjoin was a gift by the famous Rob Hordijk to the synth DIY community. He created a synth that is unrivalled in it’s ability to create wonderful sound textures by being able to modulate and cross-modulate the two voltage controlled oscillators. In addition to the oscillator textures there is a beautiful sounding filter on-board and the famous “Rungler” shift register circuit. The Rungler can be sent to both oscillators and the filter to add another dynamic to the sound pallete. This module has so much depth which over time brings more and more reward as you learn it. Professionally built and tested by me. If you have any questions, please ask!

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The Benjolin is a multifunction synthesizer designed by Rob Hordijk. The module consists of four separate function blocks: two VCOs, a state variable filter and an additional circuit, invented by Hordijk himself, called a rungler. This particular arrangement emerged from Hordijk’s efforts to design a synthesizer that was, as he puts it, “bent by design”. As such, the module functions according to principles of chaos theory, where short to long sputtering patterns spontaneously transform themselves, at times, gradually, at others, quite suddenly, morphing into new pattern doublings and bifurcations. The chaotic character of the Benjolin is anchored in Hordijk’s rungler circuit. In essence, the rungler is an 8-step shift register that takes its data input from one oscillator (OSC A) and its clock input from the other (OSC B). The output of the shift register is then fed into a primitive, digital-to-analogue converter, creating a stepped voltage pattern of variable length and depth, what Hordijk terms a “stepped havoc wave”. This rungler wave is then wired back into the oscillators, via the attenuator knobs (Run A and Run B), creating the complex interference system that lends the Benjolin its unique, aleatoric character. The inclusion of a voltage-controlled filter expands these possibilities further into the audio realm. Its design includes Hordijk’s signature, Z-plane modulation circuitry, which produces all-harmonic distortion. This gives the filter that kind of warm, organic character, reminiscent of classic tube amplifiers. This is most palpable when the resonance of the filter is turned to the maximum, with both oscillators running in the audio range. The filter’s input comprises a mix of a PWM wave (derived from the triangle waves of each oscillator) and the rungler signal itself. As with each of the oscillators, a rungler attenuator (RUN F) allows modulation of the filter as well. To round things out, CV inputs for both the oscillators and filter are normalized, each via their respective attenuators. This allows for cross modulation between the oscillators and a “sweeping” effect for the filter, hitched to Triangle B. NOTE: As with all Benjolins main output is at line level and all other outputs are at modular level. So if you want to further process this in the modular realm something like a preamp module will help (i use one channel of my MI Veils 2020 for this as it has 20db gain). Some people modify the output to be at modular level but then reported problems so I never did any mods and just use an extra module. I usually send the output to my computer for reverb anyway. This item is in the category “Musical Instruments & DJ Equipment\Pro Audio Equipment\Synthesisers & Sound Modules”. The seller is “thorosm” and is located in this country: GB. This item can be shipped to United Kingdom.

• Model: Benjolin
• Analogue/Digital: Analogue
• Input/Output Ports: CV In, CV Out, Gate In, Gate Out, Trig In
• Brand: Eurorack
• Type: Modular Synthesiser

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