Corrensponding to this file, there are two voice files:
pwm.syx and pwm2.syx
They contain the same data as in the mails below.

These are raw MIDI FIles containing System Exclusive Data (SysEx).
Most Sequencers, Dump Utilities or Librarians will allow you to
import them as SysEx, raw dump data or raw MIDI.
_______________________________________________________________________________

From owner-sy-list@spice.com Sat Nov 11 23:51:52 1995
To: sy-list@spice.com
Subject: afm pwm
Sender: owner-sy-list@spice.com
Reply-To: Christian_Stiens@ouzonix.ruhr.de (Christian Stiens)
Content-Length: 1038
X-Lines: 28

Hi!

Here I have a AFM voice for you which can be send to the 99 via
MIDI bulk dump. It is a *real* pulse width modulation
(pulse width relation can be set by modulation wheel #2)


begin 644 pwm
M\$,`>@-*3$T@(#@Q,#%60P``````````````````?P$#4%=-($U7,B`@(```#
M`````````````````````````````````````@`!0`Q``0````P````-?PX`V
M`@`!``-_``!_`#0`?P%_(`8_/S\_/S\_/S\_```#/P`````````$/P``#@$`G
M```D-TQ@`0`!``$``0```0`_/S\_/S\_/S\_```#/P````````$2/P``#@$`E
M```D-TQ@`0`!``$``0```0`_/S\_/S\_/S\_```#/P````````$$/P$`#@$`8
M```D-TQ@`0`!``$``0```0`_/S\_/S\_/S\_```#/P``!P```0`3-0``#@$@#
M`'`D-TQ@`0`!``$``0```0`_/S\_/S\_/S\_```#/P```````&$1/P``#@$`T
M`%XD-TQ@`0`!``$``0```@`_/S\_/S\_/S\_```#/P```````0$4/P$`#@$`(
M`'\D-TQ@`0`!``$``0```0`A/S\_/T!`0$!`````00``````````4`````!_X
M`0```````$!`0$!`0$``)#=,8`$``0`!``$``'\!````````0$!`0$!`0``DP
M-TQ@`0`!``$``0````!/]_!#`'H`9$Q-("`P,#0P5D,`````````````````T
M`'\!`P```!D`"``*`C\!1P`$`#<`!P`&`!1D9```&0`(``H"/P%'``0`-P`'1
B``8`%&1D9#(R````8P```&,`00!D````/`]_```````:]PH"\
``
end
size 574



-- DLG Pro v1.0

_______________________________________________________________________________

From owner-sy-list@spice.com Sat Nov 25 07:11:54 1995
To: sy-list@spice.com
Subject: PWM once more
Sender: owner-sy-list@spice.com
Reply-To: Christian_Stiens@ouzonix.ruhr.de (Christian Stiens)
Content-Length: 2476
X-Lines: 63

Hi!

>And thanks to Chris Stiens for posting the PWM thing, enjoyed it very
much!

Ok, Herbert, dann setzen wir noch einen drauf :-)

This time we put 2 sligly detuned PWMs to the left and right channel,
modulation done by a slow LFO, phase difference 180 degrees between left
and
right. This gives a nice rotating effect. MW2 sets cutoff frequency.

And how does it work?

AFM PWM is done by modulating a square wave by a saw tooth wave, which must
have a phase difference of 90 degrees, i.e. a cosaw wave :-)

The square wave is done by FM ratio 1.0<2.0 with feedback from the
modulator
to itself or by a chain 1.0<2.0<...<2.0 without feedback and suitable
output
levels (an oscilloscope helps).

The saw wave must modulate the carrier with halve the modulation index
as the modulators. It must be considered that input level 7 is the double
of level 6, level 6 is the double as level 5 and so forth. A feedback
connection with input level 7 is the same as a normal connection with
level 6.

And here comes the bulk dump (this time including the "bulk protect off"
sequence).


begin 644 pwm2
M\$,0-`\``#0``/?P0P!Z!CA,32`@.#$P,59#``````````````````!_"`10S
M5TTR("`@("`@```````````````````````````````````````,``$`#``-\
M``T`#4`*``(`#@`"``$``W\``'\+-`!_`7\G!G\#-`!_`7\A!C\_/S\+/S\_#
M/S\```,_```$````8`4O```.`2``>"0W3&`!``$``0`!```!`#\_/S\+/S\_/
M/S\```,_````````81(X```.`0``3B0W3&`!``$``0`!```"`#\_/S\+/S\_9
M/S\```,_````````81,_```.`0``6B0W3&`!``$``0`!```"`#\_/S\+/S\_M
M/S\```,_````````81`_```.`0``8B0W3&`!``$``0``6``"`#\_/S\+/S\_)
M/S\```,_````````81`_```.`0``820W3&`!``$``0`!```"`#\_/S\2/S\_X
M/S\```,_`````@``800W```.`0``=B0W3&`!``$``0`!```!```^-S\\0$!`?
M0$`!```%``!X```9``!0`````6\!````````0$!`0$!`0``D-TQ@`0`!``$`B
M`0`!;P$```````!`0$!`0$!``"0W3&`!``$``0`!````!S\_/S\+/S\_/S\`&
M``,_```$````8`4O```.`2``>"0W3&`!``$``0`!```!`#\_/S\+/S\_/S\`/
M``,_````````81(X```.`0``3B0W3&`!``$``0`!```"`#\_/S\+/S\_/S\`9
M``,_````````81,_```.`0``6B0W3&`!``$``0`!```"`#\_/S\+/S\_/S\`M
M``,_````````81`_```.`0``8B0W3&`!``$``0``6``"`#\_/S\+/S\_/S\`)
M``,_````````81`_```.`0``820W3&`!``$``0`!```"`#\_/S\2/S\_/S\`X
M``,_`````@``800W```.`0``=B0W3&`!``$``0`!```!```^-S\\0$!`0$`!B
M```%``!X``!+``!0`````6\!````````0$!`0$!`0``D-TQ@`0`!``$``0`!5
M;P$```````!`0$!`0$!``"0W3&`!``$``0`!````!W[W\$,`>@!K3$T@(#`P(
M-#!60P``````````````````?P@$````&0`(``H"/P%'``0`-P`'``8`%&1D@
M```9``@`"@(_`4<`!``W``<`!@`49&1D,C(```!C````8P!!`&0````\#W\`5
-``]_```````````$]P`W`
``
end
size 958



-- DLG Pro v1.0