[sdiy] "sample accurate light swing"

[Tony K]

Wasn't the 808 1 ms trigger pulses and the 909 , 2 ms? I remember playing with this on my 808 experiments and Compu-music analog drum triggers. I had experimented with monostables on the DX , sort of a live 'delay' .

The perceived sound difference between 1 and 2 ms was in a 'fatter' sound with the latter. But you guys are talking about timing of the interrupt oscillator on the x0x machines. Did anybody ever dump the 808 firmware . That would have been instructive to look at. Then again this could have been done by probing, or other indirect method I imagine.

TK

On ould Oct 24, 2016,at 11:32 AM, "Colin f" <colin at colinfraser.com> wrote:

>> -----Original Message-----
>> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
>> Richie Burnett
>> Sent: 24 October 2016 15:25
>> To: Adam Inglis <21pointy at tpg.com.au>; synth-diy DIY <synth-
>> diy at dropmix.xs4all.nl>
>> Subject: Re: [sdiy] "sample accurate light swing"
>> 
>> My personal opinions:
>> 
>>> So presumably this
>>> a) was a deliberate design decision, and
>> 
>> Yes, most likely.
> 
> I think it more likely it's just a consequence of the buffer size of the
> "ACB" sound generation.
> If it was done on purpose, they should have gone with 2ms.
> 
>>> b) contributes in a positive way to the feel/groove, ?
>> 
>> It make it authentic.  So it's positive if you want it to sound like the
> original
>> machine.
> 
> It could well be too small a variation to have any effect.
> The human auditory system uses inter-aural delay as a source of spatial
> information - i.e. if an impulse arrives at your left ear ~1ms before the
> right ear, you perceive it as being sourced directly to your left, because
> the path round your head takes roughly 1ms to travel at the speed of sound.
> Try it out in an audio editor :)
> Such timing differences, along with spectral markers superimposed by the
> shape of your outer ears, are critical for our 3-dimensional location of
> sound, and the reason why binaural audio is so much more immersive than
> stereo.
> The ~1ms threshold sets the limit on our ability to detect a timing
> variation in rhythmic sounds.
> The 2ms slop in the old X0Xs is just enough to be perceived.
> 
> Cheers,
> Colin f
> 
> 
> 
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