key-generator.md

Orca Key Generator

Given a root and a key, create eight variables to hold each note in the key.

Usage

In key-generator.orca, use the code between # set key # and # end # to generate the variables that store the notes in a key.

Setting the key

The r variable holds the value to the root note that will be generated. Assigning a value of 0 to this variable will generate a A key. Values for all keys below:

r	note
0	A
1	a
2	B
3	C
4	c
5	D
6	d
7	E
8	F
9	f
a	G
b	g

The value set in the k variable will determine if the key is major or minor. 1 sets the key to major and 0 sets it to minor.

k	key
0	major
1	minor
2	harmonic minor
3	melodic minor

The code below will set the key to E minor.

rV7.#.root.#
kV1.#.key..#

Using the variables created

Eight variables are created with the names 0, 1, 2, 3, 4, 5, 6, 7. Each of these holds a value that is a "universal position", or the number of half steps the note is above the note A.

Position	0	1	2	3	4	5	6	7	8	9	a	b	c	d	e	f	g	h	i	j	k	l	m	n
Note	A	a	B	C	c	D	d	E	F	f	G	g	A	a	B	C	c	D	d	E	F	f	G	g

Playing a scale

The following block of code will set the key to G major and play a scale of all of the notes generated.

rV3.#.root.#.............................................
kV0.#.key..#......Vk...Vr................................
..................0L3..3Lb...............................
.................kV0..rV3................................
.........................................................
.............Vk................Vk......Vk................
...........1L0...............1L0.....1L0.................
............0B1...............0B1.....0B1................
..........Vr.1..............Vr.1....Vr.1.................
.Vr...Vr..3A3J...Vr...Vr....3A8J....3AaJ....Vr...........
.3A0..3A2..6A1...3A5..3A7....bA1.....dA1....3Ac..........
0V3..1V5..2V7...3V8..4Va....5Vc.....6Ve....7Vf...........
.........................................................
............................Vk.......Vk..................
............................0L3......0L2.................
...........................3F0..V5..2F0..V6..............
..............................1Ac......1Ae...............
............................J5vd.....J6vf................
.............................Y........Y..................
.........................................................
#.generate.scale.positions.#.............................
.........................................................
.4C8.#.scale.#...........................................
pV3......................................................
.........................................................
#.convert.universal.values.to.notes.and.octaves.#........
.........................................................
..Vp...........................Vp........................
.V3...........................V3.........................
.8oTAaBCcDdEFfGgAaBCcDdEFfGg..8oT111222222222222333333333
.nVF..........................oV2........................
.........................................................
#.send.note.to.midi.channel.2.#..........................
.........................................................
5K...on..................................................
.....2F..................................................
..D43JJ..................................................
...%12F8f................................................