>> Try playing the same song (or your tick recording) on several different
>> devices at the same time, you'll find they likely drift apart noticeably
>> after only a minute or two.
>
> And here I was thinking that even cheap quartz oscillators are quite
> accurate...

Even cheap quartz oscillators are too expensive to just throw at a 
device like a tablet.  The audio clock is likely derived from elsewhere 
with whatever divide-down ratio was cheapest to implement (the frequency 
will likely not even be designed to be spot on 44100 if the numbers 
don't work out nicely).

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