ES P envelope and level controls in Logic Pro for Mac
ES P features an ADSR envelope that affects both the filter cutoff (ADSR Int) and the level of the sound over time. This section also covers the master level control parameters.
Envelope and level parameters
Attack slider: Set the time required for the signal to reach the initial signal level (the sustain level).
Decay slider: Set the time it takes for the signal to fall from the attack level to the sustain level.
Sustain slider: Set the signal level (the sustain level).
Release slider: Set the time it takes for the signal to fall from the sustain level to a level of zero.
Volume knob: Set the overall output level.
Velo Volume knob: Set the amount (depth) of velocity sensitivity to incoming MIDI note events. At higher values, each note is louder if struck harder. At lower values, the dynamic response is reduced, so that there is little difference when you play a note pianissimo (soft) or forte (loud/hard).
VCA Mode buttons (Controls view): Click ADSR to control the amplifier with the ADSR envelope generator. Click Gate to output a constant organ-like tone when a key is played.