Octave range and notes

Notes in Trackerboy range from octaves 2 to 8. Scientific pitch notation (SPN) is used, with C-2 being approximately 65.4 Hz (concert pitch). Valid notes range from C-2 to B-8, inclusive, for channels 1-3. Valid notes on channel 4 range from C-2 to B-6, inclusive. Attempting to use a note outside this range will result in the note being clamped to its respective boundary.

Channel frequency

Each channel has a frequency setting. Frequency in channels 1-3 is an 11-bit number (0-2047) with 0 being the lowest and 2047 being the highest. Frequency in channel 4 is a byte, with a specific format explained here. Notes in Trackerboy are mapped to specific frequencies using a table lookup. See below for the tables used.

Channel 1-3 Frequency table

Octave	C	C#	D	D#	E	F	F#	G	G#	A	A#	B
2	0x02C	0x09D	0x107	0x16B	0x1CA	0x223	0x277	0x2C7	0x312	0x358	0x39B	0x3DA
3	0x416	0x44E	0x483	0x4B5	0x4E5	0x511	0x53C	0x563	0x589	0x5AC	0x5CE	0x5ED
4	0x60B	0x627	0x642	0x65B	0x672	0x689	0x69E	0x6B2	0x6C4	0x6D6	0x6E7	0x6F7
5	0x706	0x714	0x721	0x72D	0x739	0x744	0x74F	0x759	0x762	0x76B	0x773	0x77B
6	0x783	0x78A	0x790	0x797	0x79D	0x7A2	0x7A7	0x7AC	0x7B1	0x7B6	0x7BA	0x7BE
7	0x7C1	0x7C5	0x7C8	0x7CB	0x7CE	0x7D1	0x7D4	0x7D6	0x7D9	0x7DB	0x7DD	0x7DF
8	0x7E1	0x7E2	0x7E4	0x7E6	0x7E7	0x7E9	0x7EA	0x7EB	0x7EC	0x7ED	0x7EE	0x7EF

Channel 1-3 Actual frequency

Note	Frequency (Hz)
C-2	65.41
C#2	69.31
D-2	73.43
D#2	77.79
E-2	82.38
F-2	87.32
F#2	92.50
G-2	98.03
G#2	103.86
A-2	109.96
A#2	116.51
B-2	123.42
C-3	130.81
C#3	138.55
D-3	146.78
D#3	155.48
E-3	164.87
F-3	174.53
F#3	184.87
G-3	195.92
G#3	207.72
A-3	219.92
A#3	233.22
B-3	246.84
C-4	261.62
C#4	277.11
D-4	293.88
D#4	311.33
E-4	329.33
F-4	349.53
F#4	370.26
G-4	392.43
G#4	414.78
A-4	439.84
A#4	466.45
B-4	494.61
C-5	524.29
C#5	555.39
D-5	587.77
D#5	621.19
E-5	658.65
F-5	697.19
F#5	740.52
G-5	784.86
G#5	829.57
A-5	879.68
A#5	929.59
B-5	985.50
C-6	1048.58
C#6	1110.78
D-6	1170.29
D#6	1248.30
E-6	1323.96
F-6	1394.38
F#6	1472.72
G-6	1560.38
G#6	1659.14
A-6	1771.24
A#6	1872.46
B-6	1985.94
C-7	2080.51
C#7	2221.56
D-7	2340.57
D#7	2473.06
E-7	2621.44
F-7	2788.77
F#7	2978.91
G-7	3120.76
G#7	3360.82
A-7	3542.49
A#7	3744.91
B-7	3971.88
C-8	4228.13
C#8	4369.07
D-8	4681.14
D#8	5041.23
E-8	5242.88
F-8	5698.78
F#8	5957.82
G-8	6241.52
G#8	6553.60
A-8	6898.53
A#8	7281.78
B-8	7710.12

Channel 4 Frequency table

Octave	C	C#	D	D#	E	F	F#	G	G#	A	A#	B
2	0xD7	0xD6	0xD5	0xD4	0xC7	0xC6	0xC5	0xC4	0xB7	0xB6	0xB5	0xB4
3	0xA7	0xA6	0xA5	0xA4	0x97	0x96	0x95	0x94	0x87	0x86	0x85	0x84
4	0x77	0x76	0x75	0x74	0x67	0x66	0x65	0x64	0x57	0x56	0x55	0x54
5	0x47	0x46	0x45	0x44	0x37	0x36	0x35	0x34	0x27	0x26	0x25	0x24
6	0x17	0x16	0x15	0x14	0x07	0x06	0x05	0x04	0x03	0x02	0x01	0x00