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<DIV><FONT face=Arial size=2>This isn't necessarily an answer to your question,
but maybe it'll help.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>> <FONT face="Times New Roman" size=3>...
</FONT></FONT>A gate input where the VCO is off until a gate is received, then
it starts it's cycle. when the gate is turned off the VCO finishes it's cycle
before going off ...</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>An EG with a repeat (loop) feature might do what
you want. One example is Blacet's EG1:</FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT><FONT face=Arial
size=2><A
href="http://www.blacet.com/EG1.html">http://www.blacet.com/EG1.html</A></FONT></DIV>
<DIV><FONT face=Arial size=2>Says it has </FONT><FONT face=Arial size=2>"Full
control of Attack and Decay ramps. Gated with Semi Chaotic Release Time" in LFO
mode. Um... Semi Chaotic Release Time?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Depending on the need for the LFO to finish it's
last cycle, you may just need a "reset" or "sync" feature as found on, for
example, the Blacet Micro LFO (on which it is actually called
"Gate"):</FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT><FONT face=Arial
size=2><A href="http://www.blacet.com">http://www.blacet.com</A></FONT></DIV>
<DIV><FONT face=Arial size=2>Sync/Reset is available on LFOs from most modular
makers.</FONT></DIV>
<DIV>--<BR>john</DIV>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial
size=2></FONT><BR> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=peng3002@yahoo.com href="mailto:peng3002@yahoo.com">Peng</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=synth-diy@dropmix.xs4all.nl
href="mailto:synth-diy@dropmix.xs4all.nl">SDIY</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, January 26, 2005 12:24
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [sdiy] Gated VCO cycles</DIV>
<DIV><FONT face=Arial size=2></FONT><BR></DIV>
<DIV>I was reading the VCO section in the EMU Modular Sythesizer Operation
Manual Retrospective by Dave Rossum (lost the link, it's a PDF file) and came
across an interesting feature. A gate input where the VCO is off until a gate
is received, then it starts it's cycle. when the gate is turned off the VCO
finishes it's cycle before going off (see page 7). I want to implement this
feature in some of the VCOs I'm building, but I'm not sure how to accomplish
this. Should I be looking at the switch in the VCO core?</DIV>
<DIV> I'm thinking this gated on/off could solve two problems I
have with my synth. One being: how to keep my LFO in time with live impro
drums ? For example: I'm using a +/-5V sine to modulate cutoff on a
VCF. On every key gate I would like it to modulate the frequency up before
(reset). This way, if I get the lfo speed close to the drummers tempo the
modulation sounds better (more locked).</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV> Second problem would be the sharp clicks and pops I get when
playing low bass lines, especially when the waveform has low harmonic
content, like a sinewave. They kinda come and go randomly with note ons and
sometimes note offs. I notice this with other synths with free running
oscillators and even a lot of software synths. Are these clicks/pops the
result of non-zero cossings (sorry for the sample editing speak)? I can
supress the clicks with EQ but that's not always desirable. </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV> Any info, advice, comments,ideas are desperately needed and
greatly appreciated.</DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>Thanks</DIV>
<DIV>Peng</DIV></BLOCKQUOTE></BODY></HTML>