Yamaha TG500 Owner's Manual page 124

VOICE EDIT MODE / 3: Full Edit. 3-2: AEG
L2 ... L3, R1 ... RR (AEG levels & rates)
112 3-2-01: LEVEL / 3-2-02: RATE
Range: 0 ... 63
The following diagrams illustrate how the AEG rate and level parameters
determine the overall shape of the amplitude envelope.
"Atk" Mode
The envelope begins at zero level, reaches maximum level at the rate deter-
mined by the R1 parameter, moves to L2 (Level 2) at R2 (Rate 2), moves on
to L3 (Level 3) at R3 (Rate 3), and finally decays to zero level at R4 (Rate 4)
if the note is held the entire time.
If the note is released before the end of the envelope described above, then
the sound decays to zero level from the point at which the note is released at
the rate determined by the RR (Release Rate) parameter.
R2
R3
L2
R1
L3
R4