Chippmann Omega-PhiCS-8 Series, Owner'S Manual

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CS-8 Series Omega-Phi Rev1.04, Oct. 2015
-17-
Tune : The normal position of this controller is the middle. In the positions
"upper" and "lower" it decrements/increments (left/right) the oscillators'
frequency by
1 octave (a bit more). In position "LFO" it has a much wider
range. In position "55 Hz" the frequency ranges (from left to right) from about
0.08 Hz to 12 Hz, that's a factor of 150 and equals 7.2 octaves. The rotary switch
still octaves the frequencies. So, in position "440 Hz"
Tune
ranges from 0.64 Hz
to about 100Hz. Fine, so far.
Fine : This controller was intended for finest frequency corrections and definite
beats. Normal position is the middle and it detunes the frequency once again
by
100 cent (a bit more). 100 cent equals a semitone step at the equally-
temperate scale.
1 V/Oct -jack: An external voltage at that jack increments (or decrements) the
current oscillator frequency with a sensitivity of one octave (x2) per +Volt, resp.
(
2) per -Volt (negative voltages). This input is calibrated.
0.5 V/Oct -jack: An external voltage at that jack increments (or decrements) the
current oscillator frequency with a sensitivity of two octaves (x4) per +Volt,
resp. (
4) per -Volt (negative voltages). This input is not calibrated, i.e. this
scale is tolerant with some percent and different from VCO to VCO.
Each of these influence quantities at the e-input operates by a frequency
multiplication not by summing!
8.3. The VCO core and its wave-shapes
The VCO output its frequency as different waveforms, which are sinus, triangle,
saw-tooth, variable rectangle and a 50% rectangle with
half frequency (one
octave down). Fig. 4 shows these functions and there phase relations e.g. as
voltage versus time.