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