[sdiy] JX3P Metal Sync (was Re: Idea - Triangle wave DCO core)

[KD KD]

JX3P metal is AM.

The JX8P do more of AM with a Korg VCA.

2012/3/14, Tom Wiltshire <tom at electricdruid.net>:
>
> On 14 Mar 2012, at 13:19, Florian Anwander wrote:
>
>> Hello Richie
>>
>>> Florian, have you ever worked out how the "Metal" setting on the JX-3P
>>> works? I haven't sat down and figured it out, but I'm guessing it's
>>> something like that the master resets the slave's integrator state but
>>> doesn't reset it's digital counter as well. Or maybe the other way
>>> around: The master resets the slave's digital counter, but doesn't reset
>>> the integrator state back to zero?
>> In the schematics there are two controlling signals: the signal 'Sync'
>> enables the reset of the programmable counter of the slave DCO. The signal
>> 'Met/Syn' enables the reset of the integrator of DCO2 by the counter of
>> DCO1. I never checked that in the real synth, but considering the naming
>> of those two control signals it is most likely, that sync causes a reset
>> of both, counter and integrator, while metal causes only the reset of the
>> counter.
>
> Very interesting. That sounds very likely, and drawing a few waveforms that
> you'd get out of it, it produces an interesting result.
>
> Since the slave's counter isn't reset, the frequency isn't locked to the
> master, so the underlying pitch gets a bit scrambled. This would explain why
> people think it's a ring modulator, and why it sounds "metallic".
>
> It'd be an easy addition to any Ramp DCO design. I might try it.
>
> Thanks both.
>
> Tom
>
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