Delay field: Drag vertically to set the time before the envelope attack phase begins. This setting is useful for sounds such as tambourines which have a noise element that precedes the shake or hit.
Attack handle and field: Drag the handle horizontally to set the time it takes for the envelope to reach the initial level. Drag the field vertically.
Curve and field: Drag to set the shape of the envelope attack curve. Move the pointer over the attack portion (the line) of the graphical envelope display, then drag to adjust the curve.
Hold handle and field: Drag the handle horizontally to set the time that the full level is held, following the attack phase, before the decay phase begins. Drag the field vertically.
Decay field: Drag vertically to set the time it takes for the envelope to fall to the sustain level, following the hold phase or the initial attack time.
Drag the Decay/Sustain handle horizontally to set the time it takes for the envelope to fall to the sustain level, following the attack/hold phase. Drag vertically to set the sustain level, which is held until you release the key.
If the Sustain level parameter is set to its maximum value, the Decay parameter has no effect.
If the Sustain level is set to its minimum value, the Decay parameter defines the duration or fade-out time of the note.
Note: If you release the key before the decay phase has finished, the envelope moves immediately to the release phase.
Sustain field: Drag vertically to set the sustain level, which is held until you release the key.
Release handle and field: Drag the handle horizontally to set the time it takes for the envelope to fall from the sustain level to a level of zero. Drag the field vertically.
Vel slider: Set the sensitivity of amplitude envelope modulation in response to incoming velocity data.
If the Vel slider is set to zero, the envelope outputs its maximum level when you strike the keys at any velocity.
At a Vel slider value of 100%, the entire dynamic range is under velocity control.
To explain, raising the slider value reduces the envelope minimum amplitude, with the difference being dynamically controlled by keyboard velocity. For example, when you set the Vel slider to 25%, the minimum envelope amplitude is reduced to 75%. The remaining 25% is added in response to the velocities of keys you play. So, a key played with a zero velocity results in an envelope amplitude of 75%. A key played with a MIDI velocity value of 127 will result in an envelope amplitude of 100%. When you raise the Vel slider value, the minimum amplitude decreases even further.
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Logic Pro User Guide: PDF