The filter settings
As with the oscillators, the filter possesses audio connections (a mixer) and internal
modulation inputs allowing the simplification of its use.
(Initial Filter Frequency)
Sets the filter cut-off frequency, tuned between 10 Hz
and 10 KHz
Fine tuning
(Fine tune)
Fine tuning of the filter cut-off frequency
Sets the filter resonance
Notch frequency / fc
(Notch Frequency/ fc)
Sets the frequency of the notch divided by the filter cut-
off frequency
Filter type selector
Type of filter (LP 2600 and 2500, HP, BP and notch)
Audio output
Filter audio output connection jacks
Audio input
Filter input connection jacks (initially connected to the
ring modulator, to the oscillators1 and 2 square,
oscillator3 sawtooth and noise)
Modulation inputs
Filter frequency modulation input connection jacks.
Key follow (KYBD CV): Pre-cabled for the manual
setting of the key follow
Oscillator3 sine (VCO3 Sin):pre-cabled for the manual
setting of the modulation by sine waveform of
ADSR Env: re-cabled for the manual setting of the
modulation by ADSR envelope.
It possesses a cut-off frequency setting and a resonance setting.
A setting separated from the notch filter frequency (Notch frequency) divided by the
initial filter cut-off frequency has been added. This very particular parameter (present on
the module of the ARP2500) transforms the notch filter to a low shell or high shell filter.
As for all other modulation inputs, once connected, its amplitude is set by raising the
linear potentiometer. With a right click, we obtain a higher level of precision. Receiving a
modulation coming directly from the output of a generator (envelope, oscillator,
sequencer), the maximum amplitude of modulation of +/- 9 octaves.
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