Delta times

My next area to understand is the meaning of the parameters
of the note_on event and how to convert "deltas" into note durations.
How does the duration of the note (in ticks) relate to the Ticks
paramater 192 at the header?

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Charles -

Delta times are basically delay times expressed in terms of ticks.
The Ticks parameter sets the number of ticks per quarter notes.  Your
program will need to read that number and then determine the note values
based on proportion to that number - there are many valid values that the
Ticks parameter can be set to, and few programs set them the same way.
So here's your program's output:

Track No: 0
3 events in the track
  set_tempo 0 500000
  key_signature 0 1 0
  time_signature 0 3 2 24 8

#a lot of programs relegate statistical information to track 0.  This is not
required or even neccessary, but common.  You will notice all three events
have a Delta time of '0' - so they pass their information on to whatever it
is that is reading the data immediately upon starting.

Track No: 1
64 events in the track
 a) note_on 0 0 67 64
 b) note_on 89 0 67 0
 c) note_on 7 0 71 64
 d) note_on 89 0 71 0
  note_on 7 0 74 64
  note_on 89 0 74 0
  note_on 7 0 79 64
  note_on 89 0 79 0
  note_on 7 0 69 64
  note_on 89 0 69 0
  note_on 7 0 78 64
  note_on 89 0 78 0

#a - immediately upon starting (DT = '0'), play note #67 with a velocity of
64
#b - 89 ticks later, turn note a off.
#c - 7 ticks later, play note #71 with a velocity of 64
#d - 89 ticks later, turn note c off
#and so on.

#this is actually a good example because the rhythmic information is not
exact.  You and I see that these are essentially eighth notes, but the
computer is going to have to be taught to round values off to interpret
them - i.e. ignore the 7 ticks of rest between each note and instead combine
it with the 89 ticks the previous note lasted.

Hope this helps.
Noel