amsel-core

A tool for generative composition producing monophonic phrases, organized into parts and influenced by probability sequences. "Tool" is stressed here because its aim is to be playable in a live context.

Original Doc (Swift)

Configure via .compose files or related messages to give a basic musical frame:

loop, cycles: 8
    A  major, bars: 4
    E  minor, bars: 2
    F  minor, bars: 2
    G# major, bars: 4
end

Instruct the Player object to emit a stream of MIDI events. The Player object holds two probability sequences which can be altered in real time to influence which musical event (note, accent, rest) will be played next.

Example configration:

func playFlutyMelody(output: MIDIOutput?) -> Void {
    
    // Make a sheet
    let aMinPent = Part(root: Note(69), scale: scales["pent-min"]!, length: 16)
    let dMinPent = Part(root: Note(62), scale: scales["pent-min"]!, length: 16)
    let cMajPent = Part(root: Note(60), scale: scales["pent-maj"]!, length: 16)
    let fMajPent = Part(root: Note(53), scale: scales["pent-maj"]!, length: 16)
    let sheetMelo  = Sheet(parts: [aMinPent, dMinPent, cMajPent, fMajPent])
    
    // Give it to the player
    var player = Player(sheet: sheetMelo)
    
    // Instruct the player
    player.behavior.favoredNoteLength       = .Eighth
    player.behavior.noteOrRestProbabiltySeq = [0.5, 0.5]
    
    let allowedRests: [Duration]            = [.Eighth, .Quarter]
    let allowedRestsProbs: [Probability]    = [0.7,     0.3     ]
    
    // Generate the melody
    let melody = player.generateMelodyFromSheet(allowedRest: allowedRests, 
                                                restProbs: allowedRestsProbs)
    
    // Play the melody
    for event in melody.events {
        sendWithRandomVelocity(melodyEvent: event, sendTo: output, tempo: 60)
    }
}