> Now that I know that the adjustment lever has the range, I will be
> scientific. So I recorded the tick on my tablet (1 GHz CPU) and analysed
> it. I also recorded a quartz watch as a reference. Damned if the wave
> form was > 0.6% out.

There is no reason for a tablet (or any PC/phone) to have a clock 
generator with super accuracy, it's simply wasted expense when an 
accuracy of <1% will do for the majority of tasks.  That's why 
professional sound cards have an option to use the clock from an 
incoming signal (rather than the internal one) to keep everything in sync.

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.

You could try recording the speaking clock as a reference, that is 
probably more accurate than your tablet.

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