Yes, through-zero FM means a phase reversal when
you go through 0 Hz. This is another critical
feature to get that DX sound. I've tried to
replicate DX patches on my MOTM synth and
although I can create good FM sounds, I can't get
them to sound exactly the same as a DX.
>Well, I didn´t want to make a complete DX7 replica. You can get a
>long way with just 2 VCO´s, with an EG and a VCA to control the
>feedback/FM. I´ve tried that in Reaktor, but then again thats in the
>virtual world. It would be great with real knobs.
>
>Do you by "through zero" mean that it goes down to zero hertz and
>then through to "negative" (phase reversed?) frequencies? (within
>one cycle)
>I realise this is probably not an easy design task. Just wishing :-)
>