NAME

MIDI::Bassline::Walk - Generate walking basslines

VERSION

version 0.0207

SYNOPSIS

use MIDI::Bassline::Walk;

my $bassline = MIDI::Bassline::Walk->new(verbose => 1);

my $notes = $bassline->generate('C7b5', 8);

# MIDI:
# $score->n('qn', $_) for @$notes;

DESCRIPTION

MIDI::Bassline::Walk generates randomized, walking basslines.

The "formula" implemented by this module is basically, "play any notes of the chord-root scale, plus the notes of the chord that may differ, minus the notes those replaced."

The logic (and music theory) implemented here, can generate some sour notes. This is an approximate composition tool, and not a drop-in bass player. Import rendered MIDI into a DAW and alter notes until they sound suitable.

The chords recognized by this module, are those known to Music::Chord::Note. Please see the source of that module for the list.

ATTRIBUTES

guitar

$guitar = $bassline->guitar;

Transpose notes below E2 (40) up an octave.

Default: 0

intervals

$verbose = $bassline->intervals;

Allowed intervals passed to Music::VoiceGen.

Default: -3 -2 -1 1 2 3

octave

$octave = $bassline->octave;

Lowest MIDI octave.

Default: 2

scale

$scale = $bassline->scale;

The musical scale to use, based on a given chord (i.e. $_[0] here).

Default: sub { $_[0] =~ /^[A-G][#b]?m/ ? 'minor' : 'major' }

Alternatives:

sub { 'chromatic' }

sub { $_[0] =~ /^[A-G][#b]?m/ ? 'pminor' : 'pentatonic' }

sub { '' }

The first walks the chromatic scale no matter what the chord. The second walks either the major or minor pentatonic scale, plus the notes of the chord. The last walks only the notes of the chord (no scale).

verbose

$verbose = $bassline->verbose;

Show progress.

Default: 0

METHODS

new

$bassline = MIDI::Bassline::Walk->new;
$bassline = MIDI::Bassline::Walk->new(
    guitar    => $guitar,
    intervals => $intervals,
    octave    => $octave,
    scale     => $scale,
    verbose   => $verbose,
);

Create a new MIDI::Bassline::Walk object.

generate

$notes = $bassline->generate;
$notes = $bassline->generate($chord, $n);

Generate n MIDI pitch numbers given the chord.

Defaults:

chord: C
n: 4

SEE ALSO

Data::Dumper::Compact

Carp

List::Util

Music::Chord::Note

Music::Note

Music::Scales

Music::VoiceGen

Moo

strictures

namespace::clean

AUTHOR

Gene Boggs <gene@cpan.org>

COPYRIGHT AND LICENSE

This software is Copyright (c) 2021 by Gene Boggs.

This is free software, licensed under:

The Artistic License 2.0 (GPL Compatible)

cpanm MIDI::Bassline::Walk

perl -MCPAN -e shell
install MIDI::Bassline::Walk