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When triggered (key depressed), the 911 output voltage rises in a time, T1. At the end of its
rise, the output voltage immediately falls with a characteristic time, T2, to a sustaining level,
Esus. When the key is released, the output voltage falls to zero with characteristic time, T3.
T1, T2, T3, and Esus are individually controllable by means of the 911 front panel controls.
Note that T1 and T2 apply only when a key is depressed and T3 is initiated upon releasing the
key.
The articulated sounds that you hear have an "envelope", or loudness-time contour that is the
replica of the output signal of the 911.
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