SQ-80 — Musician's Manual
− ENV 1, ENV 2, ENV 3 and ENV 4
The SQ-80 has four complex Envelopes which can be applied as Modulators. Envelope Levels
can be positive or negative. The Envelopes are used to create changes, over time, in volume.
brightness, pitch etc. An important use of Envelopes is to "fade in" the level of the Sustain Wave
(or Waves) in a sound, so that it crossfades with the Transient Attack Wave. This is done by
assigning one of the Envelopes as a modulator on the the DCA Page of the Oscillator in question.
with a Modulation Depth of up to +63, setting the DCA's LEVEL to 00. and setting that
Envelope's T1 to about 10.
Envelope Levels can go
from -63 to +63
A comprehensive discussion of the SQ-
80 Envelopes follows in the Section
entitled Understanding the En-
velopes, p. 59.
_____> VEL — Velocity
Velocity means how hard you strike a key on the keyboard. Selecting VEL as a Modulator allows
you to modulate any Manual Level with Velocity. Velocity as a Modulation Source only goes
positive (though again, assigning a negative Modulation depth will make the net result a decrease
in a Manual Level with Velocity). VEL is velocity with a straight linear curve, meaning that level
increases evenly with greater velocity.
− VEL -X
This is Velocity with a different Curve. Where the effect of VEL is linear, VEL-X is exponential.
This means that VEL-X has hardly any effect when you play at low or medium velocity, but the
level rises rapidly to maximum with very hard keystrikes. This is useful for programming
dramatic changes into a sound which only occur when you really hit a key hard. The illustration
below shows the difference between VEL and VEL-X.
− KYBD — Keyboard Tracking
Uses the position of a note on the Keyboard as a Modulator. The scaling effect of this Modulator
is figured from MIDI key 0 to MIDI key 127.
As the illustration shows, the effect of KYBD is only positive-going (though a negative
42 Section 3 — Voice Programming
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