drkzrg/absynth-fm

FM Synthesizer with step sequencer for Arduboy

abSynth-FM

FM Synthesizer with step sequencer for Arduboy.

The FM Synthesis engine is derived from FMMelody.

Installation

You need Arduboy2 Library.

Usage

See this video.

Sequencer data format (send/receive via serial port)

Syntax

A series of bytes in hexadecimal digits, separated with delimiters.

Delimiters are newline, return, or space.

All characters from '#' to the end of line are ignored. You can use '#' to include comments in your data.

Data starts with a header section followd by a series of sequence section.

Header section

field	type	value
Signature	uint8_t[4]	'abFM'
Version	uint8_t	1
Num of Sequences	uint8_t	1 or 16

Sequence section

field	type	value
Tempo	uint8_t	56..240
Transpose	int8_t	-2..+2
Flags(reserved)	uint8_t	128
Synth parameters	uint8_t[5]	0..255
Notes	int8_t[16]	(below)
End mark	uint8_t	128

Note data

type	value	description
rest	-1	no sound in the step
tie	-2	continue previous note in the step
note	48..84	48 for C4, 84 for C7

Example

One sequence

61 62 46 4D 01 01
3C 00 80 06 02 1B 01 02 3C 3C 43 43 45 45 43 FE 41 41 40 40 3E 3E 3C FE 80

16 sequences

61 62 46 4D 01 10
#Sequence 1-8
3C 00 80 06 02 1B 01 02 3C 3C 43 43 45 45 43 FE 41 41 40 40 3E 3E 3C FE 80
3C 00 80 05 02 1C 01 02 43 43 41 41 40 40 3E FE 43 43 41 41 40 40 3E FE 80
60 01 80 07 05 26 05 02 40 40 40 FE 40 40 40 FE 40 43 3C 3E 40 FE FF FF 80
60 01 80 07 05 26 05 02 41 41 41 41 41 40 40 40 40 3E 3E 40 3E FF 43 FE 80
60 01 80 07 05 26 05 02 41 41 41 41 41 40 40 40 43 43 41 3E 3C FF FF FF 80
4A FF 80 05 09 20 02 02 41 45 48 4C 41 45 47 4A 40 43 47 4A 40 43 45 48 80
C0 00 80 00 08 22 08 07 43 43 43 43 FF 46 46 46 46 FF 46 46 FF 46 46 46 80
94 00 80 00 08 22 08 07 3C 48 3C 45 3C 41 3C 43 3C 48 3C 4A 3C 47 3C 48 80
#Sequence 9-16
4C 00 80 07 03 20 01 02 34 39 3C 45 3B 3F 43 3F 42 FE 40 FE 3B FE 37 FE 80
7E 00 80 02 0C 00 07 07 3C 48 4B 4A 48 46 44 43 41 3F 3E 3F 3B 3C 3E 37 80
82 FF 80 04 01 10 01 02 3C 3C FF 3C 43 43 FF 43 45 FE 3C 45 41 FE 45 41 80
F0 00 80 04 01 10 01 02 3C 3E 40 42 44 46 48 4A 4C 4A 48 46 44 42 40 3E 80
78 FF 80 04 01 08 03 02 3E 3E 3E 3E 3E 3E 3E 3E 41 41 41 41 3C 3C 3C 40 80
73 FF 80 04 01 08 03 02 3C FE FE 3C FF 37 37 37 3C FE FE 3C FF FF 3C 3F 80
82 FF 80 02 0C 00 07 07 34 FF 45 FF 34 FF 45 34 FF 34 45 FF 34 FF 45 34 80
82 FF 80 02 0C 00 07 07 34 FF 45 FF 34 FF 45 34 FF 34 45 34 45 45 34 44 80