Apple Logic Express 7 - Manual (Page 91)

Chapter 15 ES P 91
S
The S slider determines the sustain level of the envelope generator.
R
The R slider determines the release time of the envelope generator.
Chorus
This parameter sets the intensity of the integrated chorus effect.
Overdrive
This parameter sets the overdrive/distortion level of the ES P output. Caution: The
overdrive effect significantly increases the output level.