Commodore 128D - Page 150

synthesizer. The Commodore 128 has 10 prede
fined envelopes for 10 different musical instru
ments. In using the predefined envelopes you
do not have to specify the ADSR parameters,
waveform and pulse width settings—this is
already done for you. All you have to do is spec
ify the envelope number. The rest of the parame
ters are chosen automatically by the Commo
dore 128. Here are the preselected envelopes
for different types of musical'instruments:
Envelope
Number
0
1
2
3
4
5
6
7
8
9
Instrument
Piano
Accordion
Calliope
Drum
Flute
Guitar
Harpsichord
Organ
Trumpet
Xylophone
Attack
0
12
0
0
9
0
0
0
8
0
Decay
9
0
0
5
4
9
9
9
9
9
Sustain
0
12
25
5
4
2
0
9
4
0
Release
0
0
0
0
0
1
0
0
1
0
Wave
form
2
1
0
3
0
1
2
2
2
0
Width
1536
512
2048
512
Figure 7-5. Default Parameters for ENVELOPE Statement
Now that you have a little background on the l—'
ENVELOPE statement, begin another example
by entering this statement into your Commodore \ j
128. ^
10 ENVELOPE 0, 5, 9, 2, 2, 2,1700
This ENVELOPE statement redefines the default
piano envelope (0) to the following: Attack = 5, i"" 1
Decay = 9, Sustain = 2, Release = 2, wave- —'
form remains the same (2) and the pulse width
of the variable pulse waveform is now 1700. The i~ }
piano envelope will not take on these properties **—l
until it is selected by a PLAY statement, which
you will learn later in this section. \ 1
142 USING C128 MODE—Sound and Music in C128 Mode