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Filter
Modal 008 uses a unique and novel 15 multi-mode analogue filter design providing extreme
flexibillity in terms of filter types and responses. The VCF processes the signal coming from the
oscillators (or from an external source).
The resonance network is carefully designed to allow smooth and predictable sine wave tones
on demand. The filter is subject to autotune allowing the self oscillating filter to track the
keyboard across the full 10 octaves and be played as a polyphonic 3rd oscillator. Like every
true polyphonic synthesiser, Modal 008 has an individual VCF per voice.
1.
Cutoff: This parameter controls the low-pass filter cutoff frequency. The minimum value
(i.e. 0) corresponds to about 40 Hz.
2.
Reso: This parameter controls the amount of resonance of the filter.
3.
Constant: Increasing the Reso value, especially with some filter modes, can cause an
overall volume drop: the Constant option activates a volume compensation algorithm to
counteract this effect.
4.
Mode: 008 peculiar filter design features 15 different modes:
•
Low-Pass (1LP, 2LP, 3LP, 4LP): classic low-pass filter design, from a 1-pole (-6dB/oct)
to a 4-pole (-24dB/oct) configuration
•
Notch (2N): notch filter design in a 2-pole (-12dB/oct) configuration. High Reso
values narrow down the selected frequency range to be removed
•
Notch + LowPass (2N+LP): combination of the previous notch filter design with a
1-pole low pass filter
•
Phase Shift (3PS): this filter mode shifts the phase of the incoming signal. It is a
3-pole phaser and by adjusting the cutoff parameter its phase response is changed
•
Phase Shift + LowPass (3PS+LP): combination of the previous phase shift filter
design with a 1-pole low pass filter
•
Band-Pass (2BP, 4BP): band-pass filter design, both in 1-pole and 2-pole
configurations
•
Hi-Pass (3HP, 2HP, 1HP): classic high-pass filter design, from a 1-pole to a 3-pole
(-18dB/oct) configuration
•
High-Pass + Low-Pass (3HP+LP, 2HP+LP): a combination of hi-pass and low-pass
filter designs with linked cutoff frequencies: hi-pass filter comes with a 2-pole or
3-pole design, while the low-pass is either case 1-pole
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