Nintendo GAME BOY Programming Manual page 202

Game Boy Programming Manual
d) Special Symbols
The special symbols represent special data for implementing a variety of special effects. These
include sound change, crescendo, panpot change, vibrato, tremolo, and echo. Each symbol has
its own parameters.
The following table lists these special symbols, their parameters, and the valid values
for these parameters.
Special Symbols
Symbol First Argument
Code (range)
sno SOURCE NAME
≤ ≤
($E0) 0 X 127
pan Pan value
0 ≤ X ≤ 20
($E1)
pam No. of steps
1 ≤ X ≤ 255
($E2)
vib No. of hold steps
0 ≤ X ≤ 255
($E3)
vof
($E4)
mv1 Volume
0 ≤ X ≤ 255
($E5)
mv2 No. of Steps
1 ≤ X ≤ 255
($E6)
tp1 Rate
1 ≤ X ≤ 82
($E7)
tp2 No. of steps
1 ≤ X ≤ 255
($E8)
ktp Transposition level
($E9) $E8≤F≤$FF(–value)
$00≤X≤$18
ptp Transposition level
($EA) $E8≤X≤$FF(–value)
$00≤X≤$18
Second Third Argument
Argument (range) (range)
Pan value
≤ ≤
0 Y 20
Rate Depth
≤ ≤ ≤
1 Y 255 1
Volume
≤ ≤
0 Y 255
Rate
≤ ≤
1 Y 82
202
Summary No. 1
Function
Sound change
Panpot (0=L/20=R/10=C)
(10 = default)
Move panpot
(Y takes effect after X steps)
Vibrato (no. of hold steps is the time
≤
Z 255 till vibrato takes effect)
Vibrato off
Main volume
(192 = Default value)
Move main volume
(used for crescendo/decrescendo)
(Y takes effect after X steps)
Tempo
See Note 1.
Move tempo
(Used for retardando/accelerando)
(Y takes effect after X steps)
Main key transpose
(1= semitone up/-1= semitone down)
– is the two's complement
Part key transpose
(1= semitone up/-1= semitone down)
– is the two's complement