Nintendo GAME BOY Programming Manual page 203

Special Symbols
Symbol First Argument
Code
(range)
tre No. of hold steps
≤ ≤
($EB) 0 X 255
tof
($EC)
pv1 Volume
≤ ≤
($ED) 0 X 255
pv2 No. of steps
1 ≤ X ≤ 255
($EE)
pat PAT ADRS(L)
$00 ≤ X ≤ $FF
($EF)
vch No. of steps
1 ≤ X ≤ 255
($F0)
swk No. of hold steps
0 ≤ X ≤ 255
($F1)
sws No. of hold steps
0 ≤ X ≤ 255
($F2)
sof
($F3)
tun Amount of
($F4) change
0 ≤ X ≤ 255
ecv ECHO CHANNEL
0 ≤ X ≤ 255
($F5)
eof
($F6)
edl ECHO TIME
1 ≤ X ≤ 15
($F7)
Summary No. 2
Second Argument Third Argument
(range) (range)
Rate Depth
≤ ≤ ≤
1 Y 255 1
Volume
0 ≤ Y
≤
255
PAT ADRS(H) REPEAT PAT
≤ ≤ ≤
$00 Y $FF 1
No. of steps Amount of
≤ ≤
1 Y 255 change
$DC
$FF(– value)
$00
No. of steps Amount of
≤ ≤
1 Y 255 change
$DC
$FF(– value)
$00
ECHO-VOL(L) ECHO-VOL(R)
≤ ≤
0 Y 255 0
FEED BACK FILTER No.
≤ ≤
$9D Y $FF (– 0
value)
≤ ≤
$00 Y $7F
203
Chapter 7: Super Game Boy Sound
Tremelo (no. of hold steps is the
≤
Z 255 time till tremelo takes effect)
Tremelo off
Part volume
(192=Default value)
Move part volume
(Used for crescendo/decrescendo)
(Y takes effect after X steps.)
Pattern data subroutine
≤
Z 255 Seen Note 2.
Vibrato deepens gradually over X
number of steps
Start sweep from next sound
– is the two's complement
≤ ≤
Z
≤ ≤
Z $24
Start sweep heading into next
sound
≤ ≤
Z – is the two's complement
≤ ≤
Z $24
Sweep off
Tune
(Semitone up with 255)
Echo volume
≤ ≤
Z 255 Seen Note 3.
Echo off
Echo delay
≤ ≤
Z 10 See Note 4.
– is the two's complement
Function