[sdiy] Odp: Re: Analysis of the TB-303 CPU timing

Chromatest J. Pantsmaker chromatest at azburners.org
Fri Mar 17 17:40:59 CET 2017


That's exactly the point of this test.

People claim that nothing sounds like a 303 because nothing has the same
processor of the 303.  If people can't hear the difference in 4 CPUs
designed to be listened to, then that's another step closer to calling it
nonsense.
On Mar 17, 2017 4:58 AM, "Colin f" <colin at colinfraser.com> wrote:

> > I stayed up late last night and made some more Went with some classic
> > patterns and some non musical straight 16th note stuff that should show
> the
> > theoretical differences more.
> > http://chipmusik.de/survey/index.php/355721
> >
> > But so far I guess my gut feeling was right about the "magic 303 groove"
> ;-)
>
> The problem with this test is that you are listening for timing variations
> in isolation.
> Timing differences in the range of ~1ms are inaudible to us, because
> they're
> in the range of inter-aural delays which are used for spatial location.
> While a jitter of even 2 - 3ms in an isolated sound is inaudible, when you
> hear it against another, more precisely timed sound, it becomes more
> obvious.
> You would also be better to do a double blind test, using something like
> WinABX.
> If I get a few minutes today, I'll make a recording of the method I use to
> demonstrate the tempo/irq clock interaction.
>
> Cheers,
> Colin f
>
>
>
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