Main features and operation
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Amp and Mod Envelopes
Attack Knob
Sets how quickly the envelope rises to its maximum level when
a note is struck. Fully anticlockwise and this rise time or slope
is very fast, less than half a thousanth of a second (instanta-
neous to the ear) increasing exponentially to twenty seconds
when fully clockwise. To shorten attack times turn this knob
anticlockwise and to lengthen attack times turn this knob clock-
wise.
NOTE: When the attack time is set to Zero the instantaneous
rise time of the Envelope may produce audible ‘clicks’. This is
not a faulty condition and may be useful for the creation of cer-
tain sounds. If this is undesirable, increase the Attack time until
the clicks are inaudible.
Decay Knob
Sets how quickly the envelope falls to a sustain level after the
maximum level has been reached. Fully anticlockwise and this
time is about one thousanth of a second (still instantaneous to
the ear ) increasing exponentially to twenty seconds when fully
clockwise.To shorten decay times turn this knob anticlockwise
and to lengthen decay times turn this knob clockwise.
Sustain Knob
Sets the level at which the envelope remains following the
Decay phase, only while a key is being held on a controller key-
board (or there is a Midi note on command present). Fully anti-
clockwise and the envelope will decay to zero without being
interrupted. As the knob is turned clockwise, the sustain level
increases until, when fully clockwise, the sustain level is at
maximum.
Release Knob
Sets how quickly the envelope falls from the sustain level to
zero once the note has been released. Fully anticlockwise this
time is about one thousanth of a second (instantaneous to the
ear) increasing exponentially to twenty seconds when fully
clockwise.To shorten release times turn this knob anticlockwise
and to lengthen release times turn this knob clockwise.
Amp and Mod Envelopes
The Envelopes are used to shape the sound throughout its
duration. The AMP Envelope determines the volume of the
sound with respect to its duration.
The MOD Envelope may be used to control other sound ele-
ments of the synthesizer throughout the duration of the sound.
It can control Pulse Width, Filter frequency and Oscillator Pitch.
