FILTER
Filter
BeatZille’s filters have several properties normally associated with analogue hardware. Close to
where self-oscillation starts (50 to 55), there are surprising opportunities for weird-and-wonderful
sound design. Note that all filter types are resonant and can self-oscillate.
Inputs / Gain
Like the main OUT, the filter has two audio inputs which are simply summed. The
Gain
knob
controls the input level (negative values) as well as overdrive amount (positive values).
Cutoff
Cutoff frequency is measured in semitones from 0.00 to 150.00 for a total range of about 12
octaves. The modulation range is also +/-150 semitones.
Cutoff modulation
(unlabeled)
The filter has a pair of general-purpose cutoff modulation inputs and amount controls. A typical
use would be to patch an envelope to one and an LFO to the other, but remember that you can
even use audio-rate sources in BeatZille: Try everything, experiment!
Key Follow
Key follow causes the cutoff to track MIDI notes, with a variable amount.
Resonance
The resonance
range is 0.00 to 100.00. Although self-oscillation can start around 50.00, the
actual amount of resonance depends on the
Gain
setting (see
gain
above), so quite a generous
range above that amount was necessary.
Below the Resonance control is another knob with input socket for Resonance modulation.
Outputs
There are six filter outputs, all of which can be used at the same time:
LP24
24dB per octave (4-pole) lowpass
...........
LP12
12dB per octave (2-pole) lowpass
...........
LP6
6dB per octave (1-pole) lowpass
.............
LP18
18dB per octave (3-pole) lowpass
...........
BP6
6dB per octave (1-pole) bandpass
.............
HP12
12dB per octave (2-pole) highpass with low shelf via
Gain
..........
25