music自动生成

分类：包 · 清单：use "kernels/";

简述

音乐词汇：音阶与和弦、音高、乐器音符（音色、包络、颤音、合唱）。

描述

Music’s words, not a program’s music: scales and chords (the modes and the semitones of their degrees, a note’s pitch, the chords stacked on a degree), an instrument’s note (an Instrument row: how it sounds, its envelope, its vibrato, its chorus). A program makes its songs, tunes and palette of instruments of them (the study’s game_music is one).

Layer: Media. Uses: audio, random.

use "music.entpkg";

Kernels

kernels/instrument.ent — An instrument and its note.
kernels/scale.ent — Scales and chords.

Tests

tests/ holds scenes and their replays, run on every backend: notes.replay.

方法

函数	简述
`osc_additive() -> Int`
`osc_square() -> Int`
`osc_triangle() -> Int`
`osc_bell() -> Int`
`osc_pluck() -> Int`
`osc_breath() -> Int`
`note_level(ins: Instrument, t: Float, held: Float) -> Float`	How loud a note is `t` seconds in, held `held`: its attack, its decay to its sustain, its release after it is let go.
`note_tail(ins: Instrument) -> Float`	How long after it is let go a note is still heard.
`timbre(ins: Instrument, p: Float, t: Float, seed: Int) -> Float`	One voice of an instrument whose pitch has run `p` turns, `t` seconds in (the turns, not the pitch times the time: its vibrato moves it).
`play_note(ins: Instrument, semis: Float, t: Float, held: Float, seed: Int) -> Float`	A note of an instrument at `semis` (semitones above the C below middle C), `t` seconds in, held `held`: its two voices, a little apart, its vibrato coming in after the attack.
`mode_major() -> Int`
`mode_dorian() -> Int`
`mode_phrygian() -> Int`
`mode_lydian() -> Int`
`mode_mixolydian() -> Int`
`mode_minor() -> Int`
`mode_harmonic() -> Int`
`mode_pentatonic() -> Int`
`mode_minor_pentatonic() -> Int`
`mode_in() -> Int`
`mode_hijaz() -> Int`
`pentatonic(m: Int) -> Bool`	Whether mode `m` has five degrees to an octave.
`scale_step(m: Int, d: Int) -> Int`	Degree `d` (any whole number; seven to an octave, five in the pentatonic ones) of mode `m`, in semitones above its root.
`degrees_of(m: Int) -> Int`	How many degrees an octave has in mode `m`.
`pitch_of(semis: Float) -> Float`	The pitch (Hz) of a note `semis` semitones above the C below middle C.
`chord_degree(m: Int, root: Int, k: Int) -> Int`	Tone `k` (0 root, 1 third, 2 fifth, 3 seventh) of the chord on degree `root` of mode `m`, in degrees: thirds stacked on the scale (in a pentatonic one, every other degree).
`nearest_chord_degree(m: Int, root: Int, d: Int) -> Int`	The degree, of those of chord `root`, nearest degree `d`.

类型与结构体

名称	写法
`Instrument`	`struct Instrument`
`Instruments`	`type Instruments = Rows<Instrument>;`

测试

notes.replay