[sdiy] MIDI clock query

[Tom Wiltshire]

Hi all,

I've just seen on the following page a claim that MIDI includes two messages for timing "Clock" (&F8) and "Tick"(&F9).

http://en.wikipedia.org/wiki/MIDI_beat_clock

I've never heard of such a thing before (Only "Clock", never "Tick") and other sources say &F9 is undefined. I can see the point of having two messages - I'd always wondered how MIDI indicated the start of a bar. But I doubt this is true.

Does anybody know about MIDI clock enough to fill me in?

Thanks,
Tom