MOTM

Even though there is no advantage sound-wise, I was just wondering 
technically why only the oscillator pulse and triangle waves can be used to 
hardsync another oscillator to.  The sawtooth and sine don't work for that 
purpose.  How does the sync input know the difference?

I also found it amusing that I can run audio through the MOTM filters or VCA, 
not by going through an audio input, but by going through an FM input.  I 
haven't bothered to look at the schematics, but I doubt that the audio is 
actually passing through.  Perhaps it's causing the filters or amp to become 
a sound source itself.  Is that what's happening?

-Elhardt

> Even though there is no advantage sound-wise, I was just wondering
> technically why only the oscillator pulse and triangle waves can be used
to
> hardsync another oscillator to.  The sawtooth and sine don't work for that
> purpose.  How does the sync input know the difference?

The VCO wants a nice "edge" into the SYNC input. This is because the input
is AC coupled. That is why SYNC out is a very narrow pulse.


>
> I also found it amusing that I can run audio through the MOTM filters or
VCA,
> not by going through an audio input, but by going through an FM input.  I
> haven't bothered to look at the schematics, but I doubt that the audio is
> actually passing through.  Perhaps it's causing the filters or amp to
become
> a sound source itself.  Is that what's happening?

In the filters, you can "ring" it by messing with FREQ and RES. The VCA is
probably leakage.

Paul S.

synth1@... writes:

>>The VCO wants a nice "edge" into the SYNC input. This is because the input
is AC coupled. That is why SYNC out is a very narrow pulse.<<

I was thinking it might be something like that, but I would think the 
sawtooth would then work better than a triangle.  However, thinking about the 
direction of the sawtooth on an o-scope, it must be the falling edge that 
matters.

>>In the filters, you can "ring" it by messing with FREQ and RES. The VCA is 
probably leakage.<<

Actually the freq and res knobs don't have much to do with it.  They pretty 
much work as expected.  The audio comes out a little weak and lethargic 
though, but it still works.

-Elhardt