Env3Atck
Env3Atck (Envelope 3 Attack) modulates the Attack time of ENV3.
Env3Dec
Env3Dec (Envelope 3 Decay) modulates the Decay time of ENV3.
Env3Rel
Env3Rel (Envelope 3 Release) modulates the Release time of ENV3.
Env3Time
Env3Time (Envelope 3 All Times) modulates all ENV3 time parameters: Attack, Decay, Sustain, and Release times.
Glide
This target modulates the duration of the Glide (portamento) effect. If you modulate Glide, with Velocity selected as the source, the speed of the keystrike determines the time it takes for the played notes to reach the target pitch.
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Logic Pro User Guide: PDF