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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=philgallo@attglobal.net href="mailto:philgallo@attglobal.net">phillip
m gallo</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aon.912230836@aon.at
href="mailto:aon.912230836@aon.at">Jaroslaw Ziembicki</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, June 27, 2003 7:43 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [sdiy] Sound synthesis with
microcontrollers</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff
size=2>Jarek,</FONT></SPAN></DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff size=2>Yes
i have done quite a bit of work with micro's. I find it's very
interesting stuff. There are certain issues that have to be
resolved in how you implement the user interface, i prefer to "mimik" the
analog approach as much as possible.</FONT></SPAN></DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff
size=2>regards,</FONT></SPAN></DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff
size=2>p</FONT></SPAN></DIV>
<DIV><SPAN class=410203617-27062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
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<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I developped the AT90S8535 synth according
to the simple rule: each function should have its own</FONT></DIV>
<DIV><FONT face=Arial size=2>switch </FONT><FONT face=Arial size=2>or
potentiometer (this always lacked me in the synths I
owned).</FONT></DIV>
<DIV><FONT face=Arial size=2>A couple of details:</FONT></DIV>
<DIV><FONT face=Arial size=2>Some pot values (0..255) are recalculated into
24 bit LFO/ADSR rates, I use here ROM "look-up</FONT></DIV>
<DIV><FONT face=Arial size=2>tables" </FONT><FONT face=Arial size=2>(I think
</FONT><FONT face=Arial size=2>they are </FONT><FONT face=Arial
size=2>called so). The DETUNE pot value is also converted to allow
for very fine</FONT></DIV>
<DIV><FONT face=Arial size=2>tuning </FONT><FONT face=Arial size=2>in
</FONT><FONT face=Arial size=2>the </FONT><FONT face=Arial
size=2>middle range (so I can get a really close
unisono).</FONT></DIV>
<DIV><FONT face=Arial size=2>I do neither any filtering of the pot
values nor any "debouncing" of the switches.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards</FONT></DIV>
<DIV><FONT face=Arial size=2>Jarek</FONT></DIV>
<DIV><FONT face=Arial
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