VCF FUNCTION GROUP
F31 through F35 are the DSS-1 VCF control functions. The voltage controlled filters (VCF)
can be used to affect tone color or timbre. This is achieved by removing or emphasizing
portions of the harmonic structure of the waveforms from the three sound sources (oscil
lator-1, oscillator-2, noise). These are low pass filters. They attenuate frequencies above
the cutoff frequency.
F3M/CF MODE & EG POL!
U T h e VCF mode & EG polarity function
■ The VC F mode refers to the steepness of the filter
cutoff slope. EG polarity comes into effect only if you
use the envelope generator to modulate the VCF, in
which case this determines whether the filter cutoff
frequency will be swept up or down during the attack.
• VCF mode:
Choose from - 1 2 decibels per octave attenuation or
-24dB/oct. The steeper -2 4 d B setting cuts off
more harmonics and creates more obvious filter
modulation effects. Given the same cutoff frequency,
the ™12dB setting will produce a somewhat brighter
sound, since it attenuates more gradually, passing
more harmonics above the cutoff.
• EG polarity:
When using the envelope generator to control the
filter cutoff frequency, you can set polarity to positive
or negative. The positive setting is used for conven
tional effects in which the sound becomes brighter
during the attack.
Possible VCF mode settings.
24dB, l2tJB
LEVEL
Possible EG polarity settings. j
Cutoff frequency.
2131
PROGRAM PARAMETER MODE
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