[sdiy] "sample accurate light swing"

[rburnett at richieburnett.co.uk]

The TR-8 does the same thing, Adam.  There is about +/- 1ms of timing 
jitter in the absolute time at which instruments are triggered.  (All 
triggered instruments sound at exactly the same time, but that point in 
time is slightly early or late relative to the sample where it should be 
if the tempo was rock solid.)  The original Roland instruments sampled a 
free-running analogue tempo clock every 2ms, this meant that instruments 
might trigger just after the clock state changed, or the sample might 
have just missed the clock change, and they will sound 2ms later, or 
more likely somewhere between these extremes.

A similar thing happens in the TB-303.  The shift is only about 1ms, but 
it is easily audible under the right conditions.  I remember Colin 
Fraser demonstrating this effect by carefully adjusting the tempo on his 
TB-303 at a previous Synth DIY event.

-Richie,

On 2016-10-21 04:48, Adam Inglis wrote:
> I found this interesting. David from Innerclock Systems has had a look
> at the timing of the new Roland boxes, the TR-09 and the TB-03, see
> his blog here,
> 
> http://innerclocksystems.com/blog/?p=1090
> 
> In assessing the 09, he says:
> "Internal Sync : Precisely 42 samples (0.87ms) push-pull between each
> consecutive step – think of it as sample-accurate light swing. This
> seems a common ‘feature’ in many newer drum machines and
> sequencers.”
> 
> Really? I’m pleasantly surprised if manufacturers are putting this
> sort of attention to detail in newer products.
> I can remember Colin Fraser and Richie Burnett on this list helping me
> understand how the original 909 actually really does have it’s own
> feel, due to the polling cycle of the CPU. A barely noticeable 2 ms
> “swing” I think it was.
> Maybe the big boys were listening.
> 
> As an aside, it seems David is shutting up shop.
> His boxes sure made a difference to this studio. I think he helped
> draw much-needed attention to the problems of timing jitter in
> hardware and software music systems.
> 
> AI
> 
> 
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