buahaha / nutek-chords

MIDI files generator in Go for any kind of musician. Use in DAW or play straight to your synthesiser to set your hand free.

Nutek

MIDI files generator library written in Go programming language for any kind of musician. Chords and notes for your type of DAW, game or other project with permissive MIT license from Szymon & 🎶

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WARNING! This library does not create sound itself, the goal of this library is to provide you with programmatical representation of musical tones that can be used extensively in music production using software digital audio workstations like Waveform Tracktion MuseScore.org//MuseScore's github or equipment capable of dealing with MIDI file input. For example, you could send files generated by Nutek to your synthesizer giving you free hands to do more music

---

How to use?

After setting your environment for go development...

1. Using command line terminal of your choice (Windows, Linux, macOS) create main project file (on macOS & Linux ->

mkdir Nutek && cd Nutek && \
go mod init midi.example.net && \
touch main.go

)

2. While in your project folder install module with go get command

go get github.com/buahaha/Nutek

3. and fill main.go file with example code:

package main

import (
	"log"

	"github.com/buahaha/Nutek"
)

func main() {
    middleC, err := Nutek.StringToNote("middle c") // full set of available notes below
    if err != nil {
		log.Fatalf("can't convert string to note")
	}

    Nutek.OneNote(middleC, ".") // "." - use current folder, or specify your's
}

4. Create your first MIDI file with single note spanning one whole bar

go run main.go

5. This creates MIDI file, no sound, only raw data to be used in Digital Audio Workstation

---

Currently supported chord file generators (you can use any note you want to start with):

• Major
  • Nutek.MajorTriad(middleC, ".")
• Minor
  • Nutek.MinorTriad(middleC, ".")
• Diminished
  • Nutek.Diminished(middleC, ".")
• Augmented
  • Nutek.Augmented(middleC, ".")
• Suspended 2
  • Nutek.Sus2(middleC, ".")
• Suspended 4
  • Nutek.Sus4(middleC, ".")
• Major 7th
  • Nutek.Major7th(middleC, ".")
• Minor 7th
  • Nutek.Minor7th(middleC, ".")
• 6th
  • Nutek.Chord6th(middleC, ".")
• 7th
  • Nutek.Chord7th(middleC, ".")
• 7 Suspended 2
  • Nutek.Chord7Sus2(middleC, ".")
• 7 Suspended 4
  • Nutek.Chord7Sus4(middleC, ".")
• Minor 6th
  • Nutek.Minor6th(middleC, ".")
• Diminished 7
  • Nutek.Diminished7(middleC, ".")
• Augmented 7
  • Nutek.Augmented7(middleC, ".")
• Diminished 6
  • Nutek.Diminished7(middleC, ".")

---

The following table summarizes the MIDI note numbers as defined in the MIDI standard and matched to the Middle C (note number 60) as C4.

The formula connecting the MIDI note number and the base frequency - assuming equal tuning based on A4=a'=440 Hz - is:

f=440*math.Pow(2, (n-69)/12)

MIDI note number	Key number (Organ)	Key number (Piano)	Note names (English)	Note names (German)	Frequency (Equal tuning at 440 Hz)
top of MIDI tuning range			G#9/Ab9	gis’’’’’’/ges’’’’’’	13289.75
127			G9	g’’’’’’	12543.85
126			F#9/Gb9	fis’’’’’’/ges’’’’’’	11839.82
125			F9	f’’’’’’	11175.30
124			E9	e’’’’’’	10548.08
123			D#9/Eb9	dis’’’’’’/es’’’’’’	9956.06
122			D9	d’’’’’’	9397.27
121			C#9/Db9	cis’’’’’’/des’’’’’’	8869.84
120			C9	c’’’’’’	8372.02
119			B8	h’’’’’	7902.13
118			A#8/Bb8	ais’’’’’/b’’’’’	7458.62
117			A8	a’’’’’	7040.00
116			G#8/Ab8	gis’’’’’/ges’’’’’	6644.88
115			G8	g’’’’’	6271.93
114			F#8/Gb8	fis’’’’’/ges’’’’’	5919.91
113			F8	f’’’’’	5587.65
112			E8	e’’’’’	5274.04
111			D#8/Eb8	dis’’’’’/es’’’’’	4978.03
110			D8	d’’’’’	4698.64
109			C#8/Db8	cis’’’’’/des’’’’’	4434.92
108		88	C8	c’’’’’	4186.01
107		87	B7	h’’’’	3951.07
106		86	A#7/Bb7	ais’’’’/b’’’’	3729.31
105		85	A7	a’’’’	3520.00
104		84	G#7/Ab7	gis’’’’/ges’’’’	3322.44
103		83	G7	g’’’’	3135.96
102		82	F#7/Gb7	fis’’’’/ges’’’’	2959.96
101		81	F7	f’’’’	2793.83
100		80	E7	e’’’’	2637.02
99		79	D#7/Eb7	dis’’’’/es’’’’	2489.02
98		78	D7	d’’’’	2349.32
97		77	C#7/Db7	cis’’’’/des’’’’	2217.46
96	61	76	C7	c’’’’	2093.00
95	60	75	B6	h’’’
94	59	74	A#6/Bb6	ais’’’/b’’’	1864.66
93	58	73	A6	a’’’	1760.00
92	57	72	G#6/Ab6	gis’’’/as’’’	1661.22
91	56	71	G6	g’’’	1567.98
90	55	70	F#6/Gb6	fis’’’/ges’’’	1479.98
89	54	69	F6	f’’’	1396.91
88	53	68	E6	e’’’	1318.51
87	52	67	D#6/Eb6	dis’’’/es’’’	1244.51
86	51	66	D6	d’’’	1174.66
85	50	65	C#6/Db6	cis’’’/des’’’	1108.73
84	49	64	C6	c’’’	1046.50
83	48	63	B5	h’’	987.77
82	47	62	A#5/Bb5	ais’’/b’’	932.33
81	46	61	A5	a’’	880.00
80	45	60	G#5/Ab5	gis’’/as’’	830.61
79	44	59	G5	g’’	783.99
78	43	58	F#5/Gb5	fis’’/ges’’	739.99
77	42	57	F5	f’’	698.46
76	41	56	E5	e’’	659.26
75	40	55	D#5/Eb5	dis’’/es’’	622.25
74	39	54	D5	d’’	587.33
73	38	53	C#5/Db5	cis’’/des’’	554.37
72	37	52	C5	c’’	523.25
71	36	51	B4	h’	493.88
70	35	50	A#4/Bb4	ais’/b’	466.16
69	34	49	A4 concert pitch	a’ Kammerton	440.00
68	33	48	G#4/Ab4	gis’/as’	415.30
67	32	47	G4	g’	392.00
66	31	46	F#4/Gb4	fis’/ges’	369.99
65	30	45	F4	f’	349.23
64	29	44	E4	e’	329.63
63	28	43	D#4/Eb4	dis’/es’	311.13
62	27	42	D4	d’	293.66
61	26	41	C#4/Db4	cis’/des’	277.18
60	25	40	C4 (middle C)	c’ (Schloss-C)	261.63
59	24	39	B3	h	246.94
58	23	38	A#3/Bb3	ais/b	233.08
57	22	37	A3	a	220.00
56	21	36	G#3/Ab3	gis/as	207.65
55	20	35	G3	g	196.00
54	19	34	F#3/Gb3	fis/ges	185.00
53	18	33	F3	f	174.61
52	17	32	E3	e	164.81
51	16	31	D#3/Eb3	dis/es	155.56
50	15	30	D3	d	146.83
49	14	29	C#3/Db3	cis/des	138.59
48	13	28	C3	c	130.81
47	12	27	B2	H	123.47
46	11	26	A#2/Bb2	Ais/B	116.54
45	10	25	A2	A	110.00
44	9	24	G#2/Ab2	Gis/As	103.83
43	8	23	G2	G	98.00
42	7	22	F#2/Gb2	Fis/Ges	92.50
41	6	21	F2	F	87.31
40	5	20	E2	E	82.41
39	4	19	D#2/Eb2	Dis/Es	77.78
38	3	18	D2	D	73.42
37	2	17	C#2/Db2	Cis/Des	69.30
36	1	16	C2	C	65.41
35		15	B1	H1	61.74
34		14	A#1/Bb1	Ais1/b1	58.27
33		13	A1	A1	55.00
32		12	G#1/Ab1	Gis1/As1	51.91
31		11	G1	G1	49.00
30		10	F#1/Gb1	Fis1/Ges1	46.25
29		9	F1	F1	43.65
28		8	E1	E1	41.20
27		7	D#1/Eb1	Dis1/Es1	38.89
26		6	D1	D1	36.71
25		5	C#1/Db1	Cis1/Des1	34.65
24		4	C1	C1
23		3	B0	H2	30.87
22		2	A#0/Bb0	Ais2/B2	29.14
21		1	A0		A2
20					25.96
19					24.50
18					23.12
17					21.83
16					20.60
15					19.45
14					18.35
13					17.32
12					16.35
11					15.43
10					14.57
9					13.75
8					12.98
7					12.25
6					11.56
5					10.91
4					10.30
3					9.72
2					9.18
1					8.66
0					8.18

table source

explanation or reference