This table shows the structure of a MIDI file of the type constructed by the "MIDI Builder" stack for Runtime Revolution. The first track contains information about the file as a whole, as well as meter, key sig., tempo, etc. Subsequent tracks contain the GM voice (instrument) and the MIDI event data (note on/off).

-Kurt Kaufman

HEX BYTES	NAME/PURPOSE	Constant or Variable
4d 54 68 64	MThd ID	c
00 00 00 06	len of MThd chunk	c
00 01	format 1	c
00 0x	number of tracks	v (tracks 2 or greater must contain note data, i.e. cannot be empty)
04 00	1024 PPQN	c
4d 54 72 6b	MTrk ID-track 1	c
00 00 00 1a	track 1 length (26 decimal)	c
00	empty	c
ff 58 04 xx xx xx xx	meter	v
00	empty	c
ff 59 02 00 00	key sig.	c
00	empty	c
ff 51 03 xx xx xx	tempo	v
a0	polyphonic status	c
00	empty	c
ff 2f 00	eof-track 1	c
4d 54 72 6b	MTrk ID-track 2	c
00 00 xx xx	track 2 length	v
00	empty	c
c0 xx	program selection GM voice range 0-127	v (note use of c0 for track 2)
00	empty	c
( )	note data	v
90 45 00 88 00 80 45 00 00	9 bytes silent note on/off to avoid end cutoff	c (note use of 90 and 80 for track 2)
ff 2f 00	eof track 2	c
4d 54 72 6b	MTrk ID-track 3	c
00 00 xx xx	track 3 length	v
00	empty	c
c1 xx	program selection GM voice range 0-127	v (note use of c1 for track 3)
00	empty	c
( )	note data	v
91 45 00 88 00 81 45 00 00	9 bytes silent note on/off to avoid end cutoff	c (note use of 91 and 81 for track 3)
ff 2f 00	eof track 3	c