[sdiy] "sample accurate light swing"

[Ben Bradley]

On a similar topic, this academic article was widely quoted in the
popular press when it came out last year. It analyses the hihat strike
timings and amplitudes on Michael McDonald's song "I Keep Forgettin'".
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0127902


On Mon, Oct 24, 2016 at 1:05 PM, Tony K <weplar at gmail.com> wrote:
> 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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