QuartetFileFormat

Quartet File Formats

Header

Word	Contents
0	Playback Frequency
1	Bar measurement note
2	Tempo multiplier
3	Time signature as 2 bytes
4	0
5	0
6	0
7	0

Instructions 12 bytes

Voices stored sequentially 1-2-3-4 with 1 finish marker per voice

Play Note

0	1	2	3	4	5	6	7	8	9	A	B
00	"P"	Length		Frequency				00	00	00	00

Slide to note

0	1	2	3	4	5	6	7	8	9	A	B
00	‘S’	Length		Frequency				Step size

Rest

0	1	2	3	4	5	6	7	8	9	A	B
00	"R"	Length		Frequency				00	00	00	00

Voice change

0	1	2	3	4	5	6	7	8	9	A	B
00	‘V’	00	00	00	00	00	00	00	00	Table offset

Start loop

0	1	2	3	4	5	6	7	8	9	A	B
00	‘I’	00	00	00	00	00	00	00	00	00	00

End loop

0	1	2	3	4	5	6	7	8	9	A	B
00	‘L’	00	00	00	00	00	00	Times		00	00

End voice

0	1	2	3	4	5	6	7	8	9	A	B
00	‘F’	00	00	00	00	00	00	00	00	00	00

Note lengths

The tempo is a number between 4 and 40. A semibreve is 16x this number. All other notes are multiples or fractions of this number.

Tx	Note
24	Semibreve (dotted)
16	Semibreve
12	Minim (dotted)
8	Minim
6	Crotchet (dotted)
4	Crotchet
3	Quaver (dotted)
2	Quaver
1	Semiquaver

Frequencies

00050A28	C#
0004C1BC	C
00047D66	B
00043CE2	A#
00040000	A
0003C686	G#
00039046	G
00035D12	F#
00032CBC	F
0002FF22	E
0002D412	D#
0002AB70	D
00028514	C#
000260DE	C
00023EB3	B
00021E71	A#
00020000	A
0001E343	G#
0001C823	G
0001AE89	F#
0001965E	F
00017F91	E
00016A09	D#
000155B8	D
0001428A	C#
0001306F	C
00011F59	B
00010F38	A#
00010000	A
0000F1A1	G#
0000E411	G
0000D744	F#
0000CB2F	F
0000BF68	E
0000B504	D#
0000AADC	D
0000A145	C#
00009837	C
00008FAC	B
0000879C	A#
00008000	A
000078D0	G#
00007208	G
00006BA2	F#
00006597	F
0005FEF	E
00005A82	D#
0000556E	D
000050A2	C#
00004C1B	C

.SET Voiceset file

Byte	set frequency
Byte	number of instruments + 1
20 * 7 byte blocks	[]NAME[]0
20 * 4 byte blocks	offset to sample data

All samples in AVR format (See http://www.atari-forum.com/wiki/index.php/AVR)