Sound parameters Meaning
Attack Attack time. This is the time during which the
sound goes from zero (at the moment when
you strike a key) to it’s maximum level.
Decay Decay time. Time to go from the final Attack
level to the beginning of the Sustain.
Release Release time. This is the time during which the
sound goes from the sustaining phase, to zero.
The Release is triggered by releasing a key.
Cutoff Filter cutoff. This sets the sound brightness.
Resonance Use the Filter Resonance to boost the cutoff
frequency.
LFO Depth Intensity of the Vibrato (LFO).
LFO Speed Speed of the Vibrato (LFO).
LFO Delay Delay time before the Vibrato (LFO) begins,
after the sound starts.
Sty
Sty


James here is content taking from page 102 in the PA2x....Seems that Korg uses the Low freq oscillator..as a vibrato to me...