Alesis QuadraSynth Plus, Reference Manual

Page: 108 / 191

Editing Programs: Chapter 6
QuadraSynth Plus Piano Reference Manual 109
Velocity Modulation (00 to 99)
This determines how keyboard dynamics will affect the
envelope level. When set to 99, note velocity controls the
envelope’s output; notes played hard will deliver a higher
envelope output than notes played soft. When set to 0, note
velocity will have no effect on the envelope’s output level.
Filter Envelope
Filter Envelope (Page 1)
Filter Envelope is crucial whenever you want the tonal quality of
a note to change over time, differently from its overall level.
Example: When you want the initial attack of a note to be bright,
but want the sustaining part to be filtered.
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The following Filter Envelope variables will only have any effect if the
FILTER ENVELOPE DEPTH (on Page 2 of the FILTER function) is
set to a value other than 0, or, Filter Envelope is a source in the MOD
function.
Also note that the Filter Envelope may have no effect if some other
modulation source, or the basic setting of the filter, has already pushed
the filter cutoff frequency to its maximum.
Attack (00 to 99)
This is the amount of time the envelope will take until it reaches
its maximum output level. Setting the Attack to 0 will give a
sharp edge to the sound (if the Delay is also set to 0 in FENV
Page 2--see below); a setting of 99 will result in a much slower
attack, taking many seconds before the envelope gets to
maximum.
Decay & Sustain (00 to 99)
As soon as the attack portion of the envelope finishes (when the
level reaches maximum), the envelope will decay (decrease in
level). The level it reaches is set by the Sustain control; how long
it takes to get there is set by the Decay control. In the special case
where the Sustain level is all the way up (99), then there is no
decrease and the Decay time segment is bypassed. Whatever
level the sustain is set to is the level that the decay section of the
envelope will head for. Depending on the setting of the Sustain
Decay control (see below), the envelope will either hold at the
sustain level until you release the note on the keyboard, or decay
to 0 at the Sustain Decay rate (which is on page 2 of the
envelope). You can create a long "plateau" at the start of a note
by setting the Sustain to 98 and the Decay to 99. This will cause
the envelope to take the maximum amount of time to get from
peak level to a level of 98, before the Sustain Release portion of
the envelope begins.