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VIRUS POWERCORE MANUAL 53
THE FILTER/ENV PAGE
> KEYFOLLOW
This determines to what extent the cutoff frequency of filter 2 is affected by MIDI note
number. Positive values will cause the cutoff frequency to increase as you play up the key-
board, negative values will cause it to increase as you play down the keyboard.
> RESO VEL
This determines to what extent the resonance of filter 1 is affected by MIDI velocity. Positive
values mean as you play harder, the resonance
increases
in intensity. Negative values mean
that as you play harder, the resonance
decreases
in intensity.
> ENV VEL
This determines to what extent the Filter 1 Env Amt is affected by MIDI velocity. Positive val-
ues result in velocities of less than 127 applying a negative offset to the current value of Fil-
ter 1 Env Amt. And if you understand that, then you’re doing very well indeed!
I think a practical example is in order:
Set Env Vel to +63, and Filter 1 Env Amt to 127. At this setting, playing as gently as possible
will result in the filter envelope having no effect on the cutoff frequency of filter 1. As you play
harder, the filter envelope has an increasingly noticeable effect until, at maximum velocity, the
effect is equivalent to Filter 1 Env Amt = 127 again.
If Env Vel is set to –64, and filter 1 Env Amt is set to 127, then playing as gently as possible
will result in the filter envelope having maximum effect on the cutoff frequency of filter 1. As
you play harder, the filter envelope has less and less effect until, at minimum velocity, the
effect is equivalent to Filter 1 Env Amt = 0.
NOTE:
Positive values are the most common application of this parameter, as it simulates the
way in which the tone of an acoustic instrument becomes brighter the louder it is played.
Many synth sounds bene
fi t from this effect as well.
> ENV POLARITY
Determines which way the filter envelope will sweep the cutoff frequency of filter 1. Normal
polarity means that attack sweeps upwards and decay sweeps downwards. Inverse polarity
effectively turns the filter envelope upside-down i.e. attack sweeps downwards and decay
sweeps upwards.
indigo powercore manual.book Page 53 Thursday, April 22, 2004 12:23 PM