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FILTER
SYNTH PRO offers two filters that can be used in parallel or in series.
The mix of all VCOs is passed into both filters at equal levels.
12dB VCF 1 is a multi-mode-filter with low-, band- and highpass
characteristics. Use LP/BP/HP to change between the modes. The
corresponding LED is lit red for LP, green for BP and red/green for HP.
24dB VCF 2 is a dedicated lowpass-filter (SSI2144) with a steeper
slope and different sound character.
Use the PAR/SER button to switch the filter routing between serial
(LED lit red) and parallel (LED off).
Each filter has its own set of controls to adjust the CUTOFF filter
frequency and its RESONANCE. Enabling the function GLOBAL
CUTOFF (LED lit red), the VCF 2 control adjusts both filter frequencies.
However, filter 1's VCF 1 control remains active allowing to specify a
possible offset to VCF 2.
Hint: Unlike the oscillators, the analog filters cannot be calibrated
exactly. Therefore, deviations to the oscillators' pitch may occur,
even with key follow being set to 100% (see page 14 > Modulation).
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