Filters - Elektron Analog Four Full Reference Manual

FILTERS

In the FILTERS page, settings that will affect the two track filters are found.
FILTERS
FRQ (Filter1 Frequency) controls the cutoff frequency of Filter 1,
the 4-pole lowpass transistor ladder filter. Frequencies above the
cutoff get damped while frequencies below pass through the fil-
ter.
RES (Filter1 Resonance) controls the resonance of Filter 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 fil-
ter 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 nega-
tive values also distorts the signal, but with a softer overdrive
inside the filter.
TRK (Filter1 Keytrack) lets the cutoff frequency follow the pitch of
the sound played.
ENV (Filter1 EnvF Depth) controls the amount of cutoff fre-
quency modulation from the filter envelope EnvF. The knob is
bipolar, meaning that both negative and positive modulation
depth is available.
FRQ (Filter2 Frequency) controls the cutoff frequency of Filter 2,
which is the 2-pole multimode filter located after Filter 1 and
Overdrive.
RES (Filter2 Resonance) controls the resonance of Filter 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 Reso-
nance 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 Highpass, Bandstop, and Peak. Techni-
cally all of them are 2-pole filters with resonance, but the "1-pole"
types have a flatter spectrum like simple 1-pole filters and can be
very useful also for equalizer duties.
TRK (Filter2 Keytrack) lets the cutoff frequency follow the pitch of
the sound played.
ENV (Filter2 EnvF Depth) controls the amount of cutoff fre-
quency modulation from the filter envelope EnvF. The knob is
bipolar, meaning that both negative and positive modulation
depth is available.
A-3
Appendix A: SYNTH TRACK PARAMETERS