Elektron Analog Four MKII, User Manual, Page: 84 / 108

APPENDIX A: SYNTH TRACK PARAMETERS
84
FILTERS
In the FILTERS page, settings that will affect the two track filters are found.
FILTERS
FRQ (Filter1 Frequency) sets the cutoff frequency of
Filter 1, the 4-pole lowpass transistor ladder filter.
RES (Filter1 Resonance) sets the resonance of Fil-
ter 1. Increased resonance introduces a peak in the
spectrum at the cutoff frequency. By design, Filter 1
has a stronger resonance in the higher frequencies,
which gives a characteristic electronic filter sound
when the resonance starts sharp and then falls
during a falling filter envelope.
OVR (Filter1 Overdrive) introduces distortion in the
signal path. In mid position (0) the signal is kept
clean. Increasing positive values gives a clipping
distortion after Filter 1. Increasing negative values
also distorts the signal, but with a softer overdrive
inside the filter.
TRK (Filter1 Keytrack) lets the cutoff frequency fol-
low the pitch of the sound. A setting of 32 will make
the filter track the oscillator frequency in note inter-
vals, making it possible to play the Filter 1 resonance
the same way as an oscillator is played.
DEP (Filter1 EnvF Depth) sets the amount of cutoff
frequency modulation from the filter envelope EnvF.
The knob is bipolar (both negative and positive
modulation depth is possible). Note that ENV always
affects Filter1, regardless of which modulation des-
tinations are chosen.
FRQ
(Filter2 Frequency) sets the cutoff frequency
of Filter 2, which is the 2-pole multimode filter locat-
ed after Filter 1 and Overdrive.
RES (Filter2 Resonance) sets the resonance of Fil-
ter 2. Increased resonance introduces a peak in the
spectrum at the cutoff frequency. (Except for the
Bandstop filter type, which has a notch instead of a
peak. This notch is widest at the lowest Resonance
setting.) Compared to Filter 1, Filter 2 has a more
uniform resonance behavior over the whole audio
spectrum.
TYP (Filter2 Type) selects the filter type of Filter 2.
Seven types are available: 2-pole Lowpass, 1-pole
Lowpass, Bandpass, 1-pole Highpass, 2-pole High-
pass, Bandstop, and Peak. Technically all of them
are 2-pole filters with resonance, but the “1-pole”
types have a flatter spectrum like simple 1-pole fil-
ters and can be very useful also for equalizer duties.
TRK (Filter2 Keytrack) lets the cutoff frequency
follow the pitch of the sound. A setting of 32 will
make the filter track the oscillator frequency in note
intervals.
DEP (Filter2 EnvF Depth) sets the amount of cutoff
frequency modulation from the filter envelope EnvF.
The knob is bipolar (both negative and positive
modulation depth is possible). Note that ENV always
affects Filter2, regardless of which modulation des-
tinations are chosen.