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Amplitude Envelope
Modal 008R provides a classic 4-stage ADSR contour generator for the amplifier, whose
parameters can be controlled in the VCA-EG front panel section. This envelope modulates
the amplitude level of the voice, if a value different from zero is set for the filter Amount
parameter.
1. Attack:
This parameter controls the time passing from the moment you press a key (i.e.
‘MIDI Note On’ message) until the sound reaches its maximum value
2. Decay:
This parameter controls the time passing for the sound to drop from its maximum
value to a sustain level (see below)
3. Sustain:
This parameter controls the level of the sustain phase of the sound while
keeping the key pressed: this value is reached immediately after the Decay phase, until
the note is released. For a percussive sound, put Sustain to 0 and a short Decay time.
4. Release:
This parameter controls the time passing from the moment you leave a key (i.e.
‘MIDI Note Off’ message) until the sound reaches silence
5. Drive:
This button activates the VCA’s ‘drive mode’: when this mode is on, the gain of
the VCOs are boosted while simultaneously reducing the final output to maintain the
same audio level.
6. Amount:
This parameter controls the amount of envelope applied to the VCA. If this
parameter is set to 0 you hear silence, while turning it up causes the volume to increase.
