[sdiy] "sample accurate light swing"

[Adam Inglis]

Thanks for the link Ben.
I couldn’t keep up with the maths, but it reminded me, Roland must have been looking at this stuff for a long time, given that they introduced "micro-timing” and “feel” templates way back in 1988 with their R8 drum machine.

AI
> On 25 Oct 2016, at 5:04 AM, Ben Bradley <ben.pi.bradley at gmail.com> wrote:
> 
> 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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