Analogue-sequencer

After a bit of jiggling about with the numbers, it looks like I'll be
able to generate the clock timer values from a tempo value by using a 32
bit integer divide by an 8 or 16 bit tempo value. With a bit of luck,
this will actually reduce the size of the code (assuming the divide
routine comes in at under 300 bytes or so) and enable setting of tempo
in 0.1 bpm steps using some modification to the UI (maybe a TR808 style
'fine tempo' option for the data knob).

Cheers,
Colin f