SQ-80 — Musician's Manual
Bear in mind that when you use an
Envelope or an LFO (Low Frequency Oscillator) as a Modulator.
the final effect will depend on the Modulation Depth and the Levels that are set for the Envelope or LFO on
their respective Pages.
Negative Modulation
Modulation De
th can be Positive or Ne
ative
ran
in
from -63 to +63
makin
a
reat man
interesting effects possible. If, for ex-
ample, the Manual Level is set to
48, and
the same Envelope used in the previous
examples is selected and assigned a
Negative Modulation depth, the result-
ing Volume curve looks like this:
Modulating the Filter Cutoff Frequency
Like Oscillator Volume, the
Filter Cutoff Frequency, or the Brightness contour of a Program. depends
on a combination of two things:
1) the setting of the base, or Manual
Level (the Control labeled FREQ= on the FILTER
Page). and
2) the effect of any
Modulators applied on that Page.
___-> If we set the Filter Cutof
Frequency manually (by
adjusting the parameter FREQ =
on the
FILTER Page ) to a level
of 64, and turn all Modulators OFF.
the Filter will open up to that level
when a key is pressed, allowing
frequencies below the Cutof
point to pass, and close down to
Zero when the key is released.
> If we select an Envelope as a
Modulator on the
FILTER Page
and assign it a value greater than
Zero, its effect will be added to
the the Manual Level.
> If, instead, we generate a Triangle-
shape wave with one of the
LFOs (Low Frequency Os-
cillators), and apply that LFO
wave as a Modulator on the
FIL-
TER
Page, its effect will be
added to the Manual Level, and
the Filter Cutoff Frequency will
rise and fall with the cycles of the
LFO.
46 Section 3 — Voice Programming
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