AMSTRAD cpc 6128 - Page 87

Now change line 10 in each of the following ways, and then RUN to hear the effect of
changing
the tone envelope:
10 ent 1,100,-2,2
10 ent 1,10,4,20
10 ent 1,10,-4,20
Now replace the sou n d command and the tone envelope by typing in:
10 ent 1,2,17,70
20 sound 1,71,140,15,~1
30 goto 10
run
Press [ESe] twice to break.
Now you
can put the volume envelope, tone envelope, and sou n d command together
to create various sounds.
Start with: .
10 env 1,100,1,3
20 ent 1,100,5,3
30 so~nd 1,142,300,1,1,1
run
Then replace line 2 0 by typing in:
20 ent 1,100,-2,3
run
Now replace all the lines by typing in:
I
I ~
10 env 1,100,2,2
20 ent 1,100,-2,2
30 sound 1,142,200,1,1,1
run
If you wish to create a more intricate tone envelope, the 3 parameters: <number of
steps, ,
<tone period of step' , <time per step' may be repeated at the end of the ENT
command up to 4 more times, to specify a different 'section' of the same envelope.
Try some more variations for yourself. Add some <noise, to the SOU N D command, and
try adding some extra sections to the volume and tone envelopes.
The
chapter entitled 'Complete list of AMSTRAD CPC6128 BASIC Keywords'
contains full details of
the various sound commands. If you are interested in the more
melodius aspects of sound, see
the section, 'The Sound of Music' which you will find in
the chapter entitled 'At your leisure .... '.
Chapter 1 Page 74
Foundation Course