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

Colin f colin at colinfraser.com
Fri Mar 17 09:59:25 CET 2017

> 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
> 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
You would also be better to do a double blind test, using something like
If I get a few minutes today, I'll make a recording of the method I use to
demonstrate the tempo/irq clock interaction.

Colin f

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