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The SUSTAIN
The SUSTAIN control circuitry also plays host to two envelope generators. The
Control Circuitry
envelope tracker Env 3 again follows the original waveform. The envelope
generator Env 4 maintains the level of the sustain on the peak-level over a
longer period of time. The control voltage of the VCA is again derived from
the difference between the two voltages. Sustain amplitude is increased for
positive SUSTAIN settings and reduced for negative settings.
Figure 122 on page 370
creation to control the SUSTAIN processing. Envelope generator Env 1 fol-
lows the original waveform, Env 2 is generated with prolonged sustain.
Figure 122. SPL Transient Designer Sustain Envelopes
Figure 123 on page 370
defines the control voltage of the VCA.
Figure 123. SPL Transient Designer Sustain Control Voltage
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illustrates the original waveform and the envelope
shows the difference between Env 4 and Env 3 that
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Chapter 42: SPL Transient Designer
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