>when you compile and run this you will notice that the time for the eighth
>note is way off. Any ideas as to why this is?
Measurement error.
When you start a timing sequence, Next_Time is not the current time,
but rather the time the last "delay until Next_Time" ended. Since
then you've done various IO etc. In each section, change the initial pair:
Time_Start := Ada.Real_Time.Clock;
Next_Time := Next_Time + Delta_xxx_Note;
to
Time_Start := Ada.Real_Time.Clock;
Next_Time := Time_Start + Delta_xxx_Note;
and the times come out nicely similar.