13
Amplifier
The amplifier's ADSR (attack / decay / sustain / release) envelope
curve determines how the volume of a sound changes over time.
The PRO-12 ASB's master volume control is part of the amplifier
section.
Attack
Determines the duration of the initial 'attack' phase of the ADSR
envelope curve. In this phase, the volume rises to maximum in the
time set by the attack control.
Decay
This determines the duration of the second phase of the ADSR
envelope curve. During the 'decay' phase the envelope curve falls
to the value set under 'sustain'.
Sustain
'Sustain' sets the volume at which the envelope curve comes to rest
once the decay phase is over.
Release
The 'release' controls the duration of the dieaway of the sound after
a key is released. (N.B. this dieaway is only introduced when the
'release' switch is turned on.) During the release phase of the ADSR
envelope the envelope curve falls back to minimum.
Velocity
Velocity control is a new feature not implemented on the original
1978 synthesizer. The PRO-12's volume and tone can now respond
dynamically to subtle variations of keyboard touch - the amplifier
velocity control affects overall volume, while the filter velocity con-
trol affects the instrument's tone colour. Higher velocity settings
produce greater variations of dynamic response.
Содержание PRO-12 ASB
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