[sdiy] DIN Sync/ DR-110 sync

[Anthony Rolando]

The reason I was asking about DIN Sync is because I have added DIN in/out to my DR-110 (only took me 3yrs to get around to it!) and though the clock that is outputfrom the DR-110 is a perfect sqare wave 0-5V, nothing seems to be in sync when I use that clock to drive my modular... so I was gessing that perhaps the DR-110 is clocked from the trailing edge while my analog sequencer is clocked from the leading edge.

Any shared insights or thoughts or experiences on this matter will be greatly appreciated!

Tony
----------------------------------------
> From: colin at colinfraser.com
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] DIN Sync
> Date: Mon, 10 Dec 2007 10:01:26 +0000
> 
>  
>> 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".
> 
> I've done some blind testing of different delays between sounds and the
> results were quite interesting.
> You could try this yourself using a tool like PCABX - http://www.pcabx.com/
> 
> Florian's example of 14ms MIDI delay does indeed sound as bad as he
> suggests, when sounds with a fast attack are used.
> Percussion sounds are by far the most sensitive to MIDI delay.
> I couldn't detect the 1ms of jitter introduced by the 303/606/808 internal
> clock.
> I found I could notice individual percussion sounds in a rhythm pattern when
> they were offset by as little as 2 or 3 milliseconds.
> But I wasn't noticing a difference in timing - I heard it more as a spatial
> shift, which makes sense when you consider that the part of the auditory
> system that can discriminate at such high temporal resolutions is doing so
> to determine spatial location through inter-aural delay.
> At what point this difference would be audible in a final mix is difficult
> to say.
> In the real world, up to 5ms of MIDI delay is probably inaudible to anyone
> who isn't determined to hear it.
> Which just means using multiple MIDI busses.
> 
> Cheers,
> Colin f
> 
> 
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