AMSTRAD cpc 6128 User Instruction page 413

Relative
Volume
Change
1-+1 -;.2 ...:;3:...:4T-+ 5 T6-i7~8;:-;:-9 .:r10.,11....:;12r-:1:;:...3 1::r 4 ...:;:15,-:; 16 r-: 1 'f-7 1T-8 ..:;:19-=;20;:.:21' j -' 2 =,=.2 "T23,24;:.:25f"26:r-=;.27..::;26:.,::29r:30'i'-3:;.1.::;32;.:;33;:.:34r35::.r--_ .... 1~0
: seconds
-2
-4
-8
-8
I
1
1
1
I
I
1
1
1
1
1
1
1
-10
,-+'
- - - - - - - - - - - - - - - !
stepcount ,
5,
1
ster:i ,ze :
paus~time
STEP COUNT 20
STEP SIZE 0
PAUSE TIME 1
The maximum number of sections in' an envelope is 5, and each section takes 3 values,
so the EN V command can have up to 16 parts (including the first, that identifies
which of the 15 envelopes (1 to 15) is being created). If the steps up or down cause the
volume to go above
15
or below 0 then the value will wrap around; so the step above
15
is 0, and the step below 0 is
15:
ENV 3,9,5,20
SOUND 1,142,0,0,3
This simple envelope produces 9 steps, each step increasing the volume by 5, and
each step lasting
20
hundredths of a second. After the first three steps therefore, the
volume will be
15,
so the next step will take it back round to 4, then 9 and so on. The
diagram on the following page shows the effect:
Chapter 9 Page 40
At your leisure ....