Rob Hordijk Design: Difference between revisions
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<b>OSC HRM</b><br> |
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Price 325 euro |
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The HRM VCO module can morph from waveform to another because it builds up the harmonic content from a sine and cosine waveform. |
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The Harmonic Oscillator module (OSC HRM) is used to create pitched waveforms with |
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You can morph with CV from sine to triangle. |
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dynamically controlled timbres. Pitch control law is 1V/Oct and the module uses a platinum |
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element for temperature stabilization of the pitch curve. Maximum frequency range is from |
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0.5 Hz to 16.000 Hz and the scale is perfectly tuned in the middle six octaves up to a pitch of |
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4.000 Hz. When playing pitches higher as 4000 Hz the 1V/Oct scale starts to break down, due |
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to the necessary internal bandlimiting in the harmonic generators. |
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The module uses a biquad sine/cosine oscillator at its core and through a process of recursion |
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harmonic series of overtones are generated. There are two recursion paths, one that produces |
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all harmonics and one that produces only the odd harmonics. By gradually opening the knobs |
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that control the amount of recursion more and more harmonics are generated. When only the |
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all harmonics path is used the waveform morphs smoothly from a sinewave to a waveform |
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that closely resembles and sounds like a sawtooth or an inverted sawtooth. Opening only the |
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odd harmonics knob will smoothly morph from a sinewave to a squarewave. When opening |
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both knobs effects like pulse wave modulation are possible. Building up these harmonic series |
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is under full voltage control and can be modulated from slow LFO speeds to fast audio rates |
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to create FM timbres. When the waveforms are modulated there is a negligable amount of |
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detune (less than 1 cent), though when modulating at audio rates an asymmetry in the |
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modulating waveform can cause detune effects on deep modulations. |
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There is an additional VCA incorporated in the module. The final output signal can be taken |
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from a point just before the VCA and at the output of the VCA. This enables the module to be |
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easily used in a situation where one wants to modulate another module by an audio rate signal |
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and have the modulation depth under voltage control using e.g. a LFO waveform, an envelope |
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voltage signal or a play controller that produces a control voltage, while still having the full |
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output level signal available on the full output to serve different purposes. |
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The waveforms have an exceptionally warm sound and when dynamically modulated have a |
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deep spatial and organic character. |
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With only one OSC HRM and one DUAL ENV module you can already have a voice with |
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dynamic timbral and volume control that can do e.g. a pretty solid bass line |
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<b>Dual Phaser </b><br> |
<b>Dual Phaser </b><br> |