[sdiy] DIN Sync

[Florian Anwander]

Hi Nicholas

>> In the 303, 606 and 808 the CPUs poll the clock input every 2ms to see 
>> if it has gone high.
> And people are complaining about MIDI jitter?!
> Interesting.
The MIDI-Jitter is not a problem of MIDI-Clock but of timing 
inaccuracies of individual notes against other individual notes.

Inside the TR-808 there is a masterclock, which provides that all sounds 
are triggered at the same time. This provides the perfect "banggg".

But in MIDI sending one "note on" takes 1 ms. Now lets take as an 
example the first beat of a refrain in a nice produced pop song: rhythm 
section with hh, shaker, tambourine, BD, crash; then bass, three notes 
pad, three notes piano, one melody, one sequence.
This sums to 14 ms. Added to this there will be some delays in the sound 
generators. This does not sound like "banggg" but like 
"flabbadappablapplll".

That is it what makes the TR808 series noticable tighter. The flam 
against the clock is insignificant.

Florian