<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On Mar 29, 2006, at 2:42 AM, ニコラス・ケント wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><FONT face="Helvetica" size="3" style="font: 12.0px Helvetica">I guess when it comes to doing something unusual with sync there's the Fenix where you can CV control sync "level" - - from no sync to hard sync with soft sync at the midpoint.</FONT></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Helvetica; min-height: 14px; "><BR></DIV> </BLOCKQUOTE></DIV><BR><DIV>It's also possible to create a "phase modulated sync" circuit that allows you to shift the actual sync point to anywhere in the phase of the master sawtooth wave. You can then use a control voltage to dynamically modulate the phase point where the sync occurs. </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Typically we use the master sawtooth's reset pulse as the master sync signal, but that pulse always occurs at the same phase of the sawtooth wave (usually at the peak of the wave). Phase modulated sync lets you make a reset pulse at any point in the master sawtooth wave, and lets you dynamically move that point around with an LFO, an envelope, or whatever control signal you choose.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I have heard about such circuits, but I've never actually seen a schematic or had a chance to hear one in action. I am very curious as to how it sounds. I fear that it may not be a very dramatic effect, especially compared to modulating the pitch of a synced VCO, but who knows? I'm guessing that these circuits use some kind of comparator circuit that is similar to our typical saw-to-pulse converter, with the pulse output then turned into a fast sync pulse.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>If anyone has a circuit for one of these, I'd love to see it. I think there may have been an Aries VCO module that had voltage controlled Phase Modulated Sync. This would have been a module that came out near the end of the Aries company's history (when Paul Rivera was running the company), and I don't think schematics ever got published.</DIV></BODY></HTML>