[sdiy] "sample accurate light swing"

[Ben Bradley]

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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