Just to be precise about ticks (and I already know that I'm an old pedant), but strictly speaking ticks get converted into delta times when incorporated into a MIDI file.
Ticks are not measured in a conventional time as we know it, i.e. hours minutes and seconds, but as a subdivision of a quarter note
So 'ticks', or more correctly 'PPQN' (pulses per quarter note) usually referred to as TPQN (ticks PQN) are a way of displaying a subdivision of a quarter note.
Usually these are displayed as three fields 'Measure', 'Beat' and 'Tick'. The first two should be obvious but the last has increased in size as processors have become faster.
In the Olde Dayse (Atari 520 and such like) we got about 96 ticks per quarter note, these days it's not uncommon to see 960 TPQN.
These displayed values are then converted into a delta time which is inserted between the notes in the MIDI file so that the play back mechanism knowns how long to wait between each successive MIDI event. So a delta time is the time between one MIDI event and the next.
Delta times can alter depending upon the tempo and time signature and are measured in microseconds (I think!)
John, in Logic, I believe, the song position they come under the heading 'Position'.
So Chris (Parametric) is quite right,
MIDI transmission data rate is 31250 bits per second, the bits are sent as bytes which have a start and stop bit at either end, so end up as ten bits.
The 'standard' MIDI message is three bytes long (keeping it simple) so takes about a millisecond to transmit.
As the interface runs asynchronously, it can be sent as soon as it's been created, so a three note chord (as the interface is also serial) could take three thousands of a second to transmit.
............Hang on! This is getting WAY too technical.
Yeah! I know. Splitting hairs.
P.S. There's a good synopsis of it all on page 12 of the MIDI file spec. within the complete MIDI spec. from the MMA.
OutOf, in part 8 of my MIDI Basics tutorials on my forum there's quite a detailed break down of what may go into the setup measure of a MIDI file.
MIDI Tutor forum at http://midi-tutor.proboards.com/index.cgi
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