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CS-8 ol HDH6/VDL6 Rev1.04, Feb. 2015
Freq: The influencing variables on this parameter will change the cutoff-
frequency. That is the frequency where the phase-shift at stage 6 is 180°. The
Freq (3)
damp at this frequency will increase for higher stages. The controller
affects both filters and provides a range from 2 Hz to 42 kHz. By additional
jack 11 resp. 12
external CV-voltage at
the cutoff-frequency can be driven up
to 80 kHz. This could be useful to full open the VDL6 to get at stage 6
minimum damp at high audible frequencies or to get at stage 1of the HDH6
maximum damp at lower frequencies. Vice versa relationships we get at corner
frequencies around 2 Hz or less (possible by additional negative CV-voltages)
to obtain maximum damp at stage 1 for the VDL6 for higher frequencies or to
get minimum damp at stage 6 of the HDH6 for lower frequencies. For diode
filters the damping starts very early and affects the audio spectrum slowly
more and more. So, the damping curve is very smooth, different to typical de-
Det B (4)
coupled 4-pol-filters. The controller
(detune) only affects the cutoff-
frequency of VCF B and provides a detuning of about ±3.6 octaves (x12 resp.
CV A
÷12). The regarding control inputs for the cutoff-frequency are the jacks
CV B
for VCF A and
for VCF B with a sensitivity of about 2 octaves/volt resp. a
scale of about 0.5 V/oct.. These inputs are non-calibrated.
Reso: The influencing variables on this parameter will change the self-
resonance of the filters up to self-oscillation. With increasing resonance the
filters become more and more selective around the cutoff-frequency and gain
Reso (5)
the frequencies of the incoming audio at this point. The controller
Reso
Reso
provides a range of no selectivity (
= 0) up to self-oscillation (
> 7).
Res A (13)
Res B (14)
The regarding control jacks are
and
. For a full sweep of
this parameter a voltage range ∆V of 5 volts is necessary. Depending on the
Reso
controllers' position
in one case -5 V are necessary to bring the resonance
back to zero for full clockwise position and +5 V to achieve "10" for counter
Reso
Det B (6)
clockwise position of
. The controller
affects only VCF B and
"detunes" the resonance about ±1/3 of the full range.
Drp A, Drp B: Many filters are bringing along to increasing resonance values a
concomitant damp of frequencies within the pass band. This gain loss or drop
Drp A (7)
Drp B (8)
can be adjusted with the controllers
resp.
for the filters A
and B, separately, between -24 db and 0 db for HDH6 and between -25 db and
0 db for VDL6. Fig. 4a illustrates the high-pass function, the resonance and the
drop for the HDH6 whereas Fig. 4b shows that for the VDL6.
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