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UAD Powered Plug-Ins Manual v5.2 - Just Music

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The SUSTAIN<br />

Control Circuitry<br />

The SUSTAIN control circuitry also plays host to two envelope generators. The<br />

envelope tracker Env 3 again follows the original waveform. The envelope<br />

generator Env 4 maintains the level of the sustain on the peak-level over a<br />

longer period of time. The control voltage of the VCA is again derived from<br />

the difference between the two voltages. Sustain amplitude is increased for<br />

positive SUSTAIN settings and reduced for negative settings.<br />

Figure 116 on page 321 illustrates the original waveform and the envelope<br />

creation to control the SUSTAIN processing. Envelope generator Env 1 follows<br />

the original waveform, Env 2 is generated with prolonged sustain.<br />

Figure 116. SPL Transient Designer Sustain Envelopes<br />

Figure 117 on page 321 shows the difference between Env 4 and Env 3 that<br />

defines the control voltage of the VCA.<br />

Figure 117. SPL Transient Designer Sustain Control Voltage<br />

<strong>UAD</strong> <strong>Powered</strong> <strong>Plug</strong>-<strong>Ins</strong> <strong>Manual</strong> - 321 - Chapter 37: SPL Transient Designer

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