[sdiy] Thru-Zero, was as3340 PW/tuning issue

[Adam Inglis]

Thanks all for the replies.


> On 5 Jan 2020, at 12:36 pm, ColinMuirDorward <colindorward at gmail.com> wrote:
> 
> 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). 




> On 6 Jan 2020, at 4:05 am, David G Dixon <dixon at mail.ubc.ca> wrote:
> 
> 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.  


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.
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).

Adam
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