Commodore 128D - Page 153

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the control character with a number in the allow
able range for that character. The control char
acters and the range of numbers for each are
shown in Figure 7-6. The "h" following the con
trol character refers to the number you select
from the specified range.
Control
Character
Vn
On
Tn
Un
Xn
Description
Voice
Octave
Envelope
Volume
Filter
Figure 7-6. Sound
Range
1-3
0-6
0-9
0-9
O = off,
1=on
Synthesizer
Control Characters
Default
Setting
1
4
0
9
0
Although the SID chip can process these con
trol characters in any order, for the best results,
place the control characters in your string in the
order that they appear in Figure 7-6.
You don't absolutely have to specify any of the
control characters, but you should to maximize
the power from your synthesizer. The Commo
dore 128 automatically sets the synthesizer
controls to the default settings in Figure 7-6. If
you don't assign special control characters, the
SID chip can PLAY only one envelope, one voice
and one octave without any FILTERing. Specify
the control characters to exercise the most con
trol over the notes within your PLAY string.
If you specify an ENVELOPE statement and
select your own settings instead of using the
default parameters from Figure 7-5, the enve
lope control character number in your PLAY
string must match the envelope number in your
ENVELOPE statement in order to assume the
parameters you assigned. You don't have to
specify the ENVELOPE statement at all if you
just want to PLAY the default envelope settings
from Figure 7-6. In this case, simply select an
envelope number with the (T) control character
in the PLAY statement.
145
USING C128 MODE—Sound and Music in C128 Mode