The Yamaha AN1x Synthesizer mailing list

On 23 Oct 2008 at 19:07, buenlimon wrote:

> Anyway, I still have a bit problems to understand what it means, when
> the AN1x manual explains that you can set VCO1 to "sync" and thus get
> a VCO1s synced to VCO1 by a defined interval. This I understand. But
> when I play a note I hear only the upper one (VCO1s if it's tuned
> higher).

I estimate you know how oscillator sync works, the AN1x is using a
virtual master oscillatorto sync VCO1 while VCO2 can be used
otherwise, for instance as Modulator when selected in FM Src2.

> A logical way of making a typical FM sound is to use for example VCO1
> synced to VCO1s by "12" meaning VCO1s is one octave higher than VCO1,
> and then have VCO1s modulate VCO1 through FM and have the "depth" of
> this modulation determined through FEV (which is set to another
> profile than PEV). This I have tried, but it doesn't sound like I
> expect.

Well, the problem is that (I guess) you're refering to phase
modulation, what is Yamahas Version of FM. True FM as used in analog
synths tends (due to the DC-Offset of the modulator) to detune the
Carrier Waveform and here comes the point where sync is usefull to
FM. The virtual master Oscillator can help to keep the carrier in
tune.

Hope this helps a bit!

...Summa


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