The band-reject (band-reject filter or notch) eliminates the frequencies
inside a band of frequencies. This filter is above all else interesting when we want to
vary this band of frequencies (with the “frequency” on the ARP2600 V filters or the
modulation of an LFO on this same parameter). You will thus obtain a sound close to
a “phasing” effect.
These four types of filtering are often used on analog synthesizers.
A second setting to compliment the cut-off frequency: the resonance.
(you will also find it called “emphasis” or “Q” – for Quality of filtering)
The resonance amplifies frequencies close to the cut-off frequency. The other frequencies
remaining are either unchanged (below the cut-off frequency) or reduced (above the cut-
off frequency).
On the ARP2600 V, you can increase the rate of resonance through the “resonance”
When you increase the resonance, the filter becomes more selective, the cut-off
frequency is amplified, and the sound begins to “whistle” at the cut-off frequency.
With a high resonance level, the filter will begin to produce a sound close to a sine
waveform. At this stage, the use of a key follow is very important as you can create a
melody by tuning the cut-off frequency of the filter along with the frequency of the
6.1.3 The amplifier or VCA
The amplifier (Voltage Controlled Amplifier) is charged with receiving the audio signal
coming from the filter (or directly the one from the oscillator if it is not filtered) to adjust
its volume with a potentiometer, before the signal is directed to the speakers.
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