Manual

82 DeepMind 6 User Manual
Note: The slope of the lter will update depending on the use of a 2-pole or
4-pole conguration.
8.5.2 VCF RES FADER
• The VCF RES fader controls the resonance of the lter. When resonance is
increased, the frequencies/harmonics/partials around the cut-o frequency
are emphasized. The resonance along with the lter slope help dene the
character of the lter.
The DeepMind 6 lter is capable of being driven into self oscillation. Unlike
many other synthesizers, the DeepMind 6 can guarantee an accurate pitch
even when the lter resonance is pushed to (and past) the point where the
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.
LEVEL (dB)
FREQUENCY (Hz)
LOW
SAWTOOTH SQUARE
MED
HIGH
VCF RESONANCE
LEVEL (dB)
FREQUENCY (Hz)
LEVEL (dB)
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
• This switch controls the conguration of poles used in the VCF. The
number of poles used in the lter determines the angle of the lters slope/
response curve.
The VCF uses 4-poles, but can be switched into 2-pole operation. If
congured for 4-pole operation the low-pass lter rolls o signals above
the cut-o frequency at a rate of 24 dB/octave. When congured for 2-pole
operation the low-pass lter rolls o signals above the cut-o frequency at a
rate of 12 dB/octave.
This can be useful to control the sonic character of the lter, as the 2-pole
mode will allow more of the signal above the cut-o frequency to pass and
sound brighter / more natural. The 4-pole mode allows less of the signal
above the cut-o frequency to pass and sounds deeper/ more unusual.
The 2-POLE conguration can be On (2-Pole) or O (4-Pole). The default
program setting is O (4-Pole).
ON=2P / OFF=4P
VCF POLES ( CUT OFF SLOPE)
LEVEL (dB)
4-Pole 2-Pole
FREQUENCY (Hz)