<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Thanks all for the replies.<div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 5 Jan 2020, at 12:36 pm, ColinMuirDorward <<a href="mailto:colindorward@gmail.com" class="">colindorward@gmail.com</a>> wrote:</div><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">On a regular VCO, when the FM input goes to negative, what happens to the VCO frequency? I think it either stops, or simply bounces back to the positive domain. For this reason, you get some harsh harmonics (which can sound great). <br class=""></div></div></div></blockquote></div><br class=""><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><blockquote type="cite" class=""><div class="">On 6 Jan 2020, at 4:05 am, David G Dixon <<a href="mailto:dixon@mail.ubc.ca" class="">dixon@mail.ubc.ca</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><o:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region" class="" style="caret-color: rgb(0, 0, 0);"><o:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City" class=""><o:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" class=""><div class="Section1" style="page: Section1;"><div class="" style="margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: "Times New Roman";"><span style="color: navy; font-family: Arial; font-size: 10pt;" class="">If Linear FM gain is broad and passes through zero this gives a much deeper and richer-sounding FM. It is the basis of bells, mallots, and all sorts of other strange and wonderful effects. </span></div></div></o:smarttagtype></o:smarttagtype></o:smarttagtype></div></blockquote><br class=""></div><div class=""><br class=""></div><div class="">From those descriptions it sounds like it would be a good idea to have the option of TZFM or non-TZFM for versatility in programming “not-quite-tuned” metal percussion, similar to gongs etc, as well as the more “pure” sounds like say a marimba.</div></div><div class="">A DX7’s metallic percussion can often be a little sterile or polite compared to a patch based on the cross-mod capabilities of say a P5, a JP-8, or even a JX3P (although it will certainly track more accurately across the keyboard - that’s not always important).</div><div class=""><br class=""></div><div class="">Adam</div></body></html>