SoundTrack: "CRAZY MAN" BY SEC70R ?!...
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Author: Cardinal / PGC / BD
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This article focuses on various
players AY-shnoy music. I'll tell you about a rather important
effect (especially in demomeykerstve) of the fade out music at
any time. Go tell that none of the existing PLAYER'ov
compiled Mouzon (whether Pro Tracker; Sound Tracker Pro by KSA,
etc) no such a function that would allow the smooth
reduce the volume of the music. And therefore let us go in
order ...
To make this effect, we must understand
how the processor communicates with AY and a little digging
around in PLAYERe. In the co-processor is AY 16 registers,
which are generated by different sounds. Each of these
registers, performs its function. All I I will not speak, and
focus only on three. It registers, R8, R9, R10, under 5
bits which control the loudness (amplitude) of channels A, B
and C. Generally, to gain access to any register AY, to its
number (0 to 15) recorded in the Port # FFFD, and the value -
the port # BFFD.
I deliberately did not mention this detail because it was
described in the book of Larcheko and Rodionova "ZX-Spectrum
'TR-DOS for users and programmers. "
The whole conversation, I started to the fact that
need to PLAYER'e find a place where recorded
some values in registers R8, R9 and R10.
So, before you need a place to put
trap, (CALL address, where address - your
protsedurka) will change (decrease in
certain value) bytes of those same
values before PLAYER will give them
Registers R8, R9 and R10 musical coprocessor. In the Appendix
you will find five sources in a format ALASM v3.8c. Each source
is only good for Mouzon compiled in the following editors and
compilers: Sound Tracker Pro by KSA Software; Pro Tracker v2.4;
Sound Tracker Song Compiler v1.2; Sound Tracker Music's
Recompiler v2.1 by KSA; Pro Tracker v 2.1 by Golden Disk.
Sources pretty raw, but well-demonstrated effect. How do I
use them? Download the source code in assembler, you leave
in the STS, with loads compiled Mouzon
PLAYER'om, return to the editor, corrects value of the label
MUZAK (it indicates the address of a loaded Mouzon)
assembliruete and running. If you hear music, so hearing you
all right :-)... Then try to click button "L" - music should
fall The smoothly. Click on "K" - the music will play at normal
volume. SPACE - out. Once again I repeat that the sources
demonstration, and if you use them in their programs - remove
the excess and try to optimize their length, especially the
routine starts with tags GLUSH to end, if you, of course,
succeed :-).
Finally I want to say that PLAYGEAR
COMPANY blinded part of PROGRESS MEGADEMO,
so wait for a demo of SERIOUS SPECCY GROUP! I also want to
congratulate SPECCY with pyatnadtsitiletiem and wish him to
live another same ..!
