--- In Doepfer_a100@yahoogroups.com , "Michael Wagner"
<michael.wgnr@...> wrote:

>
> On 9/18/06, selfoscillate <synaptic_music@...> wrote:
> > i think it is quite normal on vco's that the sine is not pure.
> > from a musical point of view this must not be a disadvantage,
> > but if you are doing fm it certainly is.
>
> Is it really that much of an advantage I've never had the possibility
> to do linear FM on an analog "hi-end"-VCO (by which I mean a VCO with
> an as-pure-as-possible sine wave...), so I cannot tell how the
> difference actually sounds, but from my understanding, by modulating
> one VCO with the sinewave of another, you actually modulate the
> frequency of the core-waveform of the VCO (triangle or saw), which is
> then sent through the converter. So you don't get "pure FM" anyway...
>
> -Michael
>

hello michael,

we have to differentiate between fm modulator and fm carrier,
and of course we have to differentiate between standard vco's
and through-zero-vco's. from my understanding the biggest
difference is on the carrier, which produces the fm'ed waveform.
but maybe you'll like the "not so pure" sinewave better
even for the carrier. it is all a matter of taste.
it was my fault so speak of musical disadvantages,
it is more a technical disadvantage which leads to
different sounds.

best wishes

ingo