[sdiy] Linear detuning !

[john mahoney]

> If you adjust two oscillators so they have a 1Hz beat at A=440 they
> will have a 2Hz beat at A=880.
>
> If you have linear detune, the frequency difference will be constant in
> Hertz, not in 'ratio'
>
> I never [knew] what linear FM was for... otoh I only had one oscillator
> back then :^(
>
> H^) harry

Thanks, Harry. Actually, I already knew what linear FM can do -- as you
described for everyone, thank you -- precisely because JH had explained it.
I just couldn't recall where he said it. (Either one of his web pages or an
old SDIY post, I suppose.)

Seems like a task for DCOs, anyway, because we are asking the oscs to stay
together very, very, tightly. I mean, this Linear-FM-for-Beating effect
works best if the 2 oscs have no beating to begin with. If you had 2 VCOs
that tracked so perfectly (for more than a short while after tuning), you'd
probably declare them sterile and digital sounding. ;-) Maybe some VCOs are
that precise, I dunno... but DCOs are, are course.

I used to think that beating would sound just like tremelo -- so why
bother? -- but it totallly depends on the waveshapes.
--
john