Vcf Res Fader; 2-Pole Switch - Behringer DEEPMIND 12 User Manual

68 DeepMind 12 User Manual
The diagram below shows the results from high, medium and low settings of the
cut-off frequency when applied to the SAWTOOTH and SQUARE waveforms.
VCF FREQUENCY
HIGH
FREQUENCY (Hz)
-3 dB
MED
FREQUENCY (Hz)
-3 dB
LOW
FREQUENCY (Hz)
The VCF FREQ range is from 50.0 Hz to 20000.0 Hz. The default VCF FREQUENCY
setting is 20000.0 Hz(fully open).
The fader position, current value and stored value for the VCF FREQ fader is shown
on the PROG screen. There is also a visualization of the fi lter curve as shown
below.
Note: The slope of the fi lter will update depending on the use of a 2-pole or
4-pole confi guration.

8.5.2 VCF RES FADER

The VCF RES fader controls the resonance of the fi lter. When resonance is
increased the frequencies/harmonics/partials around the cut-off frequency are
emphasized. The resonance along with the fi lter slope help defi ne the character
of the fi lter.
SAWTOOTH SQUARE
The DeepMind 12 fi lter is capable of being driven into self oscillation. Unlike many
other synthesizers, the synthesizer can guarantee an accurate pitch even when
the fi lter resonance is pushed to (and past) the point where the fi lter starts to
self-oscillate. When using this self-oscillating feature of the VCF as a sound
source, the VCF calibration ensures the correct response when playing the entire
scale of the keyboard. For more information please consult the section on
calibration later in this document.
VCF RESONANCE
LOW
FREQUENCY (Hz)
MED
FREQUENCY (Hz)
HIGH
FREQUENCY (Hz)
The VCF RES range is from 0.0% to 100.0%. The default VCF RES setting is 0.0%.
The fader position, current value and stored value for the VCF RES fader is shown
on the PROG screen. There is also a visualization of the resonance as shown below

8.5.3 2-POLE SWITCH

ON=2P / OFF=4P
This switch controls the confi guration of poles used in the VCF.
The number of poles used in the fi lter determines the angle of the fi lters slope/
response curve.
The VCF uses 4-poles, but can be switched into 2-pole operation. If confi gured for
4-pole operation the low-pass fi lter rolls off signals above the cut-off frequency
at a rate of 24 dB/octave. When confi gured for 2-pole operation the low-pass
fi lter rolls off signals above the cut-off frequency at a rate of 12 dB/octave.
SAWTOOTH SQUARE