Industrial Music ElectronicsHertz Donut MKIII Digital FM Oscillator


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Industrial Music Electronics Hertz Donut mk3

The long-awaited Hertz Donut mk3 from Industrial Music Electronics (fka The Harvestman) is a multi-operator digital oscillator for eurorack modular synthesizers. Fixated on both FM synthesis and phase distortion synthesis, this behemoth executes thru-zero frequency modulation with the utmost precision (and an unhealthy dose of turpitude).

The Hertz Donut mk3 is inflicted with four sliders that collectively constitute a sophisticated patch matrix for expedient editing of only the most crucial parameters. To exploit, simply select a source using one of the adjacent buttons and move the corresponding slider to set the amount related to each destination. Once selected, the OLED screen will display values relevant to that particular parameter. Possible destinations include the main operator frequency, subservient operator frequencies, and two sound modification algorithms. This schema gets particularly heinous when combined with the Master Modulation Control, aptly designated as MOD, which determines the overall modulation amount.

Like its sister module, the Piston Honda mk3, Hertz Donut mk3 sports a sophisticated preset management system capable of storing a total of 8 panel states for easy recall. A corresponding morph mode allows for seamless transitions between panel states, opening the gates to inherently singular sounds not advisable with conventional synthesizers. Of course, this feature can be submitted to full voltage control to make things even more demented.

Hertz Donut mk3 Features

  • Perpetrates FM and PD synthesis
  • Thru-zero FM
  • Slider matrix facilitates tactile control
  • Buttons for expedient parameter selection
  • OLED screen displays all crucial parameters
  • Multi-destination parameter editing
  • Master Modulation Control (MOD) dictates overall modulation amount
  • Eurorack module
  • Width: 17hp
  • Depth: 25mm
  • Current draw: 150mA @ +12v, 40mA @ -12v
SignalRelated ArticlesBest Eurorack Oscillators of 2019Favorite Modular Sound Generators This YearModulation in DepthThe Basics of Phase Distortion and Frequency ModulationAn Interview with Scott JaegerAn Interview with Scott Jaeger (Industrial Music Electronics)Superbooth 2019The More Synths, The Merrier
Product Demo Videos
Industrial Music Electronics Hertz Donut mk3 Product Demo
Industrial Music Electronics demonstrates their latest module, the Hertz Donut mk3, in our Burbank showroom.
The Harvestman Hertz Donut MK3 Digital FM & Phase Distortion Oscillator
The Hertz Donut MK3 is a new digital frequency modulation and phase distortion oscillator from Industrial Music Electronics, formerly The Harvestman. The main oscillator of the Hertz Donut Mk3 has 3 wavefolding algorithms which can be modulated by the two operator oscillators and an external input. The main oscillator can also be FMed by the two operators, and the operators can modulate each other with a 3x4 modulation matrix. The Hertz Donut MK3 is great for creating metallic textures with complex harmonics and modulation.

The second part of this video shows one use for the preset system in the Hertz Donut MK3, saving 8 distinct sounds and then selecting them with a sequencer to make a rhythmic pattern. The sequencer we used was the Stillson Hammer MK2.
Industrial Music Electronics Hertz Donut MKIII Digital FM Oscillator Reviews