txt: ## dist_zef-pelevesque-MIDI-Make.md
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  # MIDI::Make
  
  A [Raku](https://www.raku.org) module to make MIDI files.
  
  ## Synopsis
  
  ```
  use MIDI::Make;
  
  my \t = Track.new;
  t.copyright:      'c 2022 anonymous';
  t.name:           'melody';
  t.instrument:     'piano';
  t.controller:     8, 100;
  t.program-name:   'electric piano';
  t.port:           'MIDI Out 1';
  t.channel         1;
  t.program-change: 100;
  t.aftertouch:     100;
  t.pitch-bend:     0;
  t.marker:                 'section I';
  t.text:           'Lorem ipsum dolor sit amet.';
  t.key-signature:  2♭, minor;
  t.tempo:          ♩80;
  t.time-signature: 3\2;
  t.aftertouch:     100, 53;
  t.note-on:        60;
  t.lyric:          'one';
  t.delta-time:         128;
  t.note-off:       60;
  t.cue:            'door slam';
  t.velocity-on:    80;
  t.velocity-off:   10;
  t.note-on:        72;
  t.lyric:          'two';
  t.delta-time:         128;
  t.note-off:       72;
  t.sysex:          <0A 29 1E>;
  t.add-bytes:      <00 F0 0A 29 1E F7>;
  
  my \s = Song.new(:PPQ(96));
  s.add-track(t.render);
  
      # Print the MIDI contents.
  say s.render;
  
      # Save the MIDI contents to file.
  spurt 'file.mid', s.render;
  
  ```
  
  ## Versioning
  
  MIDI::Make uses [Semantic Versioning](https://semver.org).
  
  ## Installation
  
  You can install MIDI::Make using [Zef](https://github.com/ugexe/zef).
  
  ```
  ➤ zef install MIDI::Make
  
  ```
  
  ## Import
  
  ```
  use MIDI::Make;
  
  ```
  
  ## Usage
  
  MIDI::Make works by creating the Song class and then populating it
  with zero or more tracks created using the Track class. The resulting
  MIDI information can be outputed using the Song class's render method.
  
  ## The Song class
  
  The Song class is used to store and modify MIDI information in order
  to create a MIDI file. It has some optional parameters, the add-track
  method to add tracks, and the render method to output the MIDI
  information created up to that point.
  
  ```
      # Instantiating without parameters.
  my \s = Song.new;
  
  ```
  
  ### Parameters
  
  Parameters can be set on instantiation, or anytime afterwards.
  
  #### format
  
  The format parameter specifies the type of MIDI file format to use.
  
  It can have three values: 0, 1, or 2. The default is 1.
  
  * 0 - All data is merged on a single track.
  * 1 - Tracks are separated, and played together.
  * 2 - Tracks are separated, and played one after the other.
  
  ```
      # Set on instantiation.
  my \s = Song.new(:format(0));
  
  ```
  
  ```
      # Set after instantiation.
  my \s = Song.new;
  s.format: 0;
  
  ```
  
  #### time-division
  
  The time-division parameter defines how MIDI time will be divided.
  
  It can have two values: quarter for quarter notes, and frame. The
  default is quarter.
  
  ```
      # Set on instantiation.
  my \s = Song.new(:time-division('frame'));
  
  ```
  
  ```
      # Set after instantiation.
  my \s = Song.new;
  s.time-division: 'frame';
  
  ```
  
  #### PPQ (pulses per quarter note)
  
  The PPQ parameter sets the pulses per quarter note of the
  time-division parameter when the latter is set to quarter. If
  time-division is set to frame, PPQ is ignored.
  
  The PPQ value is from 0 to 32767. The default is 48.
  
  ```
      # Set on instantiation.
  my \s = Song.new(:PPQ(96));
  
  ```
  
  ```
      # Set after instantiation.
  my \s = Song.new;
  s.PPQ: 96;
  
  ```
  
  #### FPS (frames per second)
  
  The FPS parameter sets the frames per second of the time-division
  parameter when the latter is set to frame. If time-division is set to
  quarter, FPS is ignored.
  
  FPS can have four values: 24, 25, 29.97, or 30. The default is 24.
  
  ```
      # Set on instantiation.
  my \s = Song.new(:time-division('frame'), :FPS(30));
  
  ```
  
  ```
      # Set after instantiation.
  my \s = Song.new;
  s.time-division: 'frame';
  s.FPS: 30;
  
  ```
  
  #### PPF (pulses per frame)
  
  The PPF parameter sets the pulses per frame of the time-division
  parameter when the latter is set to frame. If time-division is set to
  quarter, PPF is ignored.
  
  The PPF value is from 0 to 255. The default is 4.
  
  ```
      # Set on instantiation.
  my \s = Song.new(:time-division('frame'), :PPF(8));
  
  ```
  
  ```
      # Set after instantiation.
  my \s = Song.new;
  s.time-division: 'frame';
  s.PPF: 8;
  
  ```
  
  ### Methods
  
  #### add-track
  
  The add-track method accepts a rendered track, and adds it to the Song
  class.
  
  ```
      # Create a track.
  my \t = Track.new;
  t.note-on:    60;
  t.delta-time:     100;
  t.note-off:   60;
  
      # Add it to the Song class.
  my \s = Song.new;
  s.add-track($t.render);
  
  ```
  
  #### render
  
  The render method renders the MIDI file information gathered up to
  that point.
  
  ```
  my \s = Song.new;
  say s.render;
  
  ```
  
  ## Operators
  
  MIDI::Make creates two operators that serve as helpers for the Track
  class described below.
  
  ### ♩
  
  The quarter notes per minute operator transforms quarter notes per
  minute to microseconds per quarter note.
  
  This permits specifying tempo in a musical human-readable way.
  
  ```
      # 60 QPM using microseconds per quarter note.
  my \t = Track.new;
  t.tempo: 1000000;
  
      # 60 QPM using the MIDI::Make operator.
  my \t = Track.new;
  t.tempo: ♩60;
  
  ```
  
  ### \
  
  The time-signature operator is used to specify a time-signature for
  the Track class's time-signature method.
  
  ```
  my \t = Track.new;
  t.time-signature: 3\8;
  
  ```
  
  ## The Track class
  
  The Track class is used to create a MIDI track which can then be added
  to the Song class.
  
  ```
      # Instantiating without parameters.
  my \t = Track.new;
  
  ```
  
  ### Parameters
  
  Parameters can be set on instantiation, or anytime afterwards.
  
  #### copyright
  
  The copyright parameter lets you set the MIDI file's copyright using
  ASCII characters.
  
  Note: This copyright is usually placed at time 0 of the first track
  in the sequence.
  
  ```
      # Set on instantiation.
  my \t = Track.new(:copyright('c 2022 anonymous'));
  
  ```
  
  ```
      # Set after instantiation.
  my \t = Track.new;
  t.copyright: 'c 2022 anonymous';
  
  ```
  
  #### name
  
  The name parameter lets you set the track's name using
  ASCII characters.
  
  ```
      # Set on instantiation.
  my \t = Track.new(:name('melody'));
  
  ```
  
  ```
      # Set after instantiation.
  my \t = Track.new;
  t.name: 'melody';
  
  ```
  
  #### delta-time
  
  Delta time sets the time in MIDI pulses between MIDI events.
  
  The delta-time value is from O to 268435455. The default is 0.
  
  Note: Although it's possible to instantiate delta-time to a value
  other than 0, usually you will start a MIDI file with a MIDI event,
  and not a period of time.
  
  ```
      # Set on instantiation.
  my \t = Track.new(:delta-time(100));
  
  ```
  
  ```
      # Set after instantiation.
  my \t = Track.new;
  t.delta-time: 100;
  
  ```
  
  Delta-time is automatically set to 0 after each of the MIDI events
  implemented in the Track class. This is done so that you can enter
  many MIDI events consecutively before setting a new delta-time.
  
  ```
  my \t = Track.new;
  t.note-on:    60;
  t.delta-time:     100; # Wait 100 MIDI pulses before following events.
  t.note-off:   60;
  t.note-on:    62;
  t.note-on:    64;
  t.delta-time:     200; # Wait 200 MIDI pulses before following events.
  t.note-off:   62;
  t.note-off:   64;
  
  ```
  
  #### channel
  
  Channel sets the MIDI channel to use.
  
  The channel value is from 0 to 15. The default is 0.
  
  ```
      # Set on instantiation.
  my \t = Track.new(:channel(1));
  
  ```
  
  ```
      # Set after instantiation.
  my \t = Track.new;
  t.channel: 1;
  
  ```
  
  #### velocity-off
  
  velocity-off sets the note-off velocity.
  
  The velocity-off value is from 0 to 127. The default is 0.
  
  Note: A velocity for a note-off seems weird, but it can change the
  sound on certain instruments like an organ on which notes can be
  depressed at different speeds.
  
  ```
      # Set on instantiation.
  my \t = Track.new(:velocity-off(10));
  
  ```
  
  ```
      # Set after instantiation.
  my \t = Track.new;
  t.velocity-off: 10;
  
  ```
  
  #### velocity-on
  
  velocity-on sets the note-on velocity.
  
  The velocity-on value is from 0 to 127. The default is 0.
  
  ```
      # Set on instantiation.
  my \t = Track.new(:velocity-on(60));
  
  ```
  
  ```
      # Set after instantiation.
  my \t = Track.new;
  t.velocity-on: 60;
  
  ```
  
  ### Methods
  
  #### text
  
  The text method adds any type of text to a track.
  
  ```
  my \t = Track.new;
  t.text: 'Lorem ipsum dolor sit amet.';
  
  ```
  
  #### instrument
  
  The instrument method lets you set the track's instrument using
  ASCII characters.
  
  ```
  my \t = Track.new;
  t.instrument: 'piano';
  
  ```
  
  #### lyric
  
  The lyric method adds a lyric anywhere on the track.
  
  ```
  my \t = Track.new;
  t.lyric: 'one';
  
  ```
  
  #### marker
  
  The marker method allows you to mark the beginning of important
  sequences in a track. E.g. section I, section II, outro, etc.
  
  ```
  my \t = Track.new;
  t.marker: 'section I';
  
  ```
  
  #### cue
  
  The cue method adds a cue anywhere on the track.
  
  ```
  my \t = Track.new;
  t.cue: 'door slam';
  
  ```
  
  #### program-name
  
  The program-name method adds a program name anywhere on the track.
  
  ```
  my \t = Track.new;
  t.program-name: 'electric piano';
  
  ```
  
  #### port
  
  The port method adds a MIDI port name anywhere on the track.
  
  ```
  my \t = Track.new;
  t.port: 'MIDI Out 1';
  
  ```
  
  #### tempo
  
  The tempo method sets the MIDI tempo. It accepts one argument: The
  tempo in microseconds per quarter note. You can either set it with a
  value from 0 to 16777215, or use the quarter notes per minute operator
  defined earlier in this file. The default value is 500000 which is
  equivalent to a tempo of 120 quarter notes per minute.
  
  ```
  my \t = Track.new;
  t.tempo: 1000000; # Set the tempo to 60 quarter notes per minute.
  t.tempo: ♩120;    # Set the tempo to 120 quarter notes per minute.
  
  ```
  
  #### time-signature
  
  The time-signature method sets the MIDI time-signature. It accepts
  three optional arguments:
  
  1. The time-signature set using the time-signature operator defined
     earlier in this file. The default is 4\4.
  2. The pulses per metronome click (PPMC). This value can be from
     0 to 255. The default is 24.
  3. 32nds per quarter note. This value can be from 0 to 255.
     The default is 8.
  
  ```
  my \t = Track.new;
  t.time-signature: 3\4;
  t.time-signature: 4\4, 48;
  t.time-signature: 2\8, 32, 12;
  
  ```
  
  #### key-signature
  
  The key-signature method sets the key-signature of the piece. It
  accepts two optional arguments:
  
  1. The key which is defined as the number of accidentals. This value
     can be from -7 to 7 where -1 to -7 is the number of flats, and
     1 to 7 is the number of sharps. It is also possible to use
     1♭, 2♭ ... 7♭ instead of -1 to -7 for flats, and 1♯, 2♯ ... 7♯
     instead of 1 to 7 for sharps. You can also use 0♭ or 0♯ instead of
     0.
  2. The mode which is either 0 for major, or 1 for minor. MIDI::Make
     provides you with the Modes enums that you may use
     instead of 0 and 1.
  
  ```
  my \t = Track.new;
  t.key-signature: -2, 1;     # G minor
  t.key-signature: 2♭, 1;     # G minor with unicode number of flats.
  t.key-signature: 2♭, minor: # G minor with Modes enum.
  
  ```
  
  #### note-off
  
  The note-off method creates a note off. It accepts two arguments: The
  note number from 0 to 127 (required), and the velocity-off from
  0 to 127 (optional). The default velocity-off is the one set by
  the velocity-off parameter.
  
  ```
  my \t = Track.new;
  t.note-off: 60;     # velocity-off == 0
  t.note-off: 62, 10; # velocity-off == 10
  t.note-off: 64;     # velocity-off == 0
  t.velocity-off: 10;
  t.note-off: 66;     # velocity-off == 10
  
  ```
  
  #### note-on
  
  The note-on method creates a note on. It accepts two arguments: The
  note number from 0 to 127 (required), and the velocity-on from
  0 to 127 (optional). The default velocity-on is the one set by
  the velocity-on parameter.
  
  ```
  my \t = Track.new;
  t.note-on: 60;      # velocity-on == 127
  t.note-on: 62, 100; # velocity-on == 100
  t.note-on: 64;      # velocity-on == 127
  t.velocity-on: 100;
  t.note-on: 66;      # velocity-on == 100
  
  ```
  
  #### aftertouch
  
  The aftertouch method is a multi method for both note aftertouch, and
  channel aftertouch.
  
  For a note aftertouch, you provide two arguments: The aftertouch
  amount from 0 to 127, and the note number from 0 to 127.
  
  For a channel aftertouch, you simply provide the aftertouch amount.
  
  ```
  my \t = Track.new;
  t.aftertouch: 100, 53; # note aftertouch
  t.aftertouch: 100;     # channel aftertouch
  
  ```
  
  #### controller
  
  The controller method is used to set a controller MIDI event.
  
  The first argument is the controller number from 0 to 127. The second
  argument is the controller value also from 0 to 127.
  
  ```
  my \t = Track.new;
  t.controller: 8, 100; # balance_MSB of 100.
  
  ```
  
  You can also call specific controllers using the following methods:
  
  | # | method | value | use | definition |
  | --- | --- | --- | --- | --- |
  | 0 | bank-select\_MSB | 0-127 | MSB | Change patch banks. |
  | 1 | modulation\_MSB | 0-127 | MSB | Create a vibrato effect. |
  | 2 | breath\_MSB | 0-127 | MSB | Breath controller. |
  | 3 | - | - | - | - |
  | 4 | foot-pedal\_MSB | 0-127 | MSB | Foot pedal data. |
  | 5 | portamento-time\_MSB | 0-127 | MSB | Control portamento rate. |
  | 6 | data-entry\_MSB | 0-127 | MSB | Control value for NRPN/RPN parameters. |
  | 7 | channel-volume\_MSB | 0-127 | MSB | Control the channel volume. |
  | 8 | balance\_MSB | 0-127 | MSB | Control left/right balance for stereo. |
  | 9 | - | - | - | - |
  | 10 | pan\_MSB | 0-127 | MSB | Control left/right balance for mono. |
  | 11 | expression\_MSB | 0-127 | MSB | Expression is a percentage of volume. |
  | 12 | effect-control\_1\_MSB | 0-127 | MSB | Control an effect parameter. |
  | 13 | effect-control\_2\_MSB | 0-127 | MSB | Control an effect parameter. |
  | 14-15 | - | - | - | - |
  | 16 | general-control\_1\_MSB | 0-127 | MSB | General purpose controller. |
  | 17 | general-control\_2\_MSB | 0-127 | MSB | General purpose controller. |
  | 18 | general-control\_3\_MSB | 0-127 | MSB | General purpose controller. |
  | 19 | general-control\_4\_MSB | 0-127 | MSB | General purpose controller. |
  | 20-31 | - | - | - | - |
  | 32 | bank-select\_LSB | 0-127 | LSB | Change patch banks. |
  | 33 | modulation\_LSB | 0-127 | LSB | Create a vibrato effect. |
  | 34 | breath\_LSB | 0-127 | LSB | Breath controller. |
  | 35 | - | - | - | - |
  | 36 | foot-pedal\_LSB | 0-127 | LSB | Foot pedal data. |
  | 37 | portamento-time\_LSB | 0-127 | LSB | Control portamento rate. |
  | 38 | data-entry\_LSB | 0-127 | LSB | Control value for NRPN/RPN parameters. |
  | 39 | channel-volume\_LSB | 0-127 | LSB | Control the channel volume. |
  | 40 | balance\_LSB | 0-127 | LSB | Control left/right balance for stereo. |
  | 41 | - | - | - | - |
  | 42 | pan\_LSB | 0-127 | LSB | Control left/right balance for mono. |
  | 43 | expression\_LSB | 0-127 | LSB | Expression is a percentage of volume. |
  | 44 | effect-control\_1\_LSB | 0-127 | LSB | Control an effect parameter. |
  | 45 | effect-control\_2\_LSB | 0-127 | LSB | Control an effect parameter. |
  | 46-47 | - | - | - | - |
  | 48 | general-control\_1\_LSB | 0-127 | LSB | General purpose controller. |
  | 49 | general-control\_2\_LSB | 0-127 | LSB | General purpose controller. |
  | 50 | general-control\_3\_LSB | 0-127 | LSB | General purpose controller. |
  | 51 | general-control\_4\_LSB | 0-127 | LSB | General purpose controller. |
  | 52-63 | - | - | - | - |
  | 64 | hold\_1-pedal | <63=off | 64>=0n | Sustain pedal 1 on/off switch. |
  | 65 | portamento | <63=off | 64>=0n | Portmento on/off switch. |
  | 66 | sostenuto | <63=off | 64>=0n | Sostenuto on/off switch. |
  | 67 | soft-pedal | <63=off | 64>=0n | Soft pedal on/off switch. |
  | 68 | legato-footswitch | <63=off | 64>=0n | Legato on/off switch. |
  | 69 | hold\_2-pedal | <63=off | 64>=0n | Sustain pedal 2 on/off switch. |
  | 70 | sound-control\_1 | 0-127 | LSB | Sound control. (variation) |
  | 71 | sound-control\_2 | 0-127 | LSB | Sound control. (resonance) |
  | 72 | sound-control\_3 | 0-127 | LSB | Sound control. (release time) |
  | 73 | sound-control\_4 | 0-127 | LSB | Sound control. (attack time) |
  | 74 | sound-control\_5 | 0-127 | LSB | Sound control. (cutoff frequency) |
  | 75 | sound-control\_6 | 0-127 | LSB | Generic sound control. |
  | 76 | sound-control\_7 | 0-127 | LSB | Generic sound control. |
  | 77 | sound-control\_8 | 0-127 | LSB | Generic sound control. |
  | 78 | sound-control\_9 | 0-127 | LSB | Generic sound control. |
  | 79 | sound-control\_10 | 0-127 | LSB | Generic sound control. |
  | 80 | general-control\_5 | 0-127 | LSB | Generic or decay on/off switch. |
  | 81 | general-control\_6 | 0-127 | LSB | Generic or hi-pass on/off switch. |
  | 82 | general-control\_7 | 0-127 | LSB | Generic on/off switch. |
  | 83 | general-control\_8 | 0-127 | LSB | Generic on/off switch. |
  | 84 | portamento-control | 0-127 | note | Control portamento amount. |
  | 85-87 | - | - | - | - |
  | 88 | hi-res-velocity-prefix | 0-127 | MSB | Extend the range of velocities. |
  | 89-90 | - | - | - | - |
  | 91 | effect\_1-depth | 0-127 | LSB | Effect control. (reverb) |
  | 92 | effect\_2-depth | 0-127 | LSB | Effect control. (tremolo) |
  | 93 | effect\_3-depth | 0-127 | LSB | Effect control. (chorus) |
  | 94 | effect\_4-depth | 0-127 | LSB | Effect control. (detune) |
  | 95 | effect\_5-depth | 0-127 | LSB | Effect control. (phaser) |
  | 96 | data-increment | N/A | N/A | Increment data for NRPN/RPN messages. |
  | 97 | data-decrement | N/A | N/A | Decrement data for NRPN/RPN messages. |
  | 98 | NRPN\_LSB | 0-127 | LSB | NRPN for controllers: 6, 38, 96, 97 |
  | 99 | NRPN\_MSB | 0-127 | MSB | NRPN for controllers: 6, 38, 96, 97 |
  | 100 | RPN\_LSB | 0-127 | LSB | RPN for controllers: 6, 38, 96, 97 |
  | 101 | RPN\_MSB | 0-127 | MSB | RPN for controllers: 6, 38, 96, 97 |
  | 102-119 | - | - | - | - |
  | 120 | all-sounds-off | 0 | - | Mute all sounds. |
  | 121 | reset-controllers | 0 | - | Reset all controllers to defaults. |
  | 122 | local-switch | 0=off | 127=on | MIDI workstation on/off switch. |
  | 123 | all-notes-off | 0 | - | Mute all sounding notes. |
  | 124 | omni-mode-off | 0 | - | Set to omni mode off. |
  | 125 | omni-mode-on | 0 | - | Set to omni mode on. |
  | 126 | mono-mode | 0-127 | num-channel | Set device mode to monophonic. |
  | 127 | poly-mode | 0 | - | Set device mode to polyphonic. |
  
  Ex:
  
  ```
  my \t = Track.new;
  t.pan_MSB: 64;
  
  ```
  
  It's also possible to call the MSB and LSB counterparts (controllers
  in the range of 0-63) with one function. This permits specifying a
  value between 0 and 16383 in one go.
  
  | method | value | definition |
  | --- | --- | --- |
  | bank-select | 0-16383 | Change patch banks. |
  | modulation | 0-16383 | Create a vibrato effect. |
  | breath | 0-16383 | Breath controller. |
  | foot-pedal | 0-16383 | Foot pedal data. |
  | portamento-time | 0-16383 | Control portamento rate. |
  | data-entry | 0-16383 | Control value for NRPN/RPN parameters. |
  | channel-volume | 0-16383 | Control the channel volume. |
  | balance | 0-16383 | Control left/right balance for stereo. |
  | pan | 0-16383 | Control left/right balance for mono. |
  | expression | 0-16383 | Expression is a percentage of volume. |
  | effect-control\_1 | 0-16383 | Control an effect parameter. |
  | effect-control\_2 | 0-16383 | Control an effect parameter. |
  | general-control\_1 | 0-16383 | General purpose controller. |
  | general-control\_2 | 0-16383 | General purpose controller. |
  | general-control\_3 | 0-16383 | General purpose controller. |
  | general-control\_4 | 0-16383 | General purpose controller. |
  
  Ex:
  
  ```
  my \t = Track.new;
  t.pan: 3489;
  
  ```
  
  #### program-change
  
  Changes the program of the current channel.
  
  It has one argument, the program number from 0 to 127.
  
  ```
  my \t = Track.new;
  t.program-change: 100; # Effect 5 in General MIDI.
  
  ```
  
  #### pitch-bend
  
  The pitch-bend method applies a pitch bend to the current channel. It
  takes an optional argument from 0 to 16383. Values below 8192 bend the
  pitch downwards, and values above 8192 bend the pitch upwards. If no
  argument is given, the pitch bend returns to its default value of 8192
  which is no pitch bend. The pitch range may vary from instrument to
  instrument, but is usually +/- 2 semitones.
  
  ```
  my \t = Track.new;
  t.pitch-bend: 0; # Bends the pitch as low as possible.
  t.pitch-bend;    # Removes pitch bend by applying the default: 8192.
  
  ```
  
  #### sysex
  
  The sysex method implements a simple sysex message. It takes a list
  of dataBytes, and surrounds them with sysex start and end bytes:
  F0 F7
  
  ```
  my \t = Track.new;
  t.sysex: <0A 29 1E>;
  
  ```
  
  #### add-bytes
  
  The add-bytes method lets you add arbitrary bytes to the track. Unlike
  other methods, it does not add delta-time nor does it reset delta-time
  to 0. add-bytes is mostly useful for testing purposes.
  
  ```
  my \t = Track.new;
  t.add-bytes: <00 F0 0A 29 1E F7>;
  
  ```
  
  #### render
  
  The render method renders the MIDI track information gathered up to
  that point. It is used to pass the track's MIDI data to the Song
  class.
  
  ```
  my \t = Track.new;
  t.note-on:    60;
  t.delta-time:     128;
  t.note-off:   60;
  
  my \s = Song.new;
  s.add-track($t.render);
  
  ```
  
  ## Running Tests
  
  To run all tests, simply use the following command in the root of
  MIDI::Make.
  
  ```
  ➤ raku -Ilib t/all.rakutest
  
  ```
  
  Alternatively, you can use
  [Test::Selector](https://raku.land/zef:lucs/Test::Selector) to
  selectively run tests.
  
  ```
  ➤ tsel     :: Run all tests.
  ➤ tsel s1  :: Run the s1 test.
  ➤ tsel s\* :: Run all s tests.
  
  ```
  
  ## Resources
  
  * [Official MIDI Specification](https://www.midi.org/specifications)
  * [One-pager MIDI Specification](https://github.com/colxi/midi-parser-js/wiki/MIDI-File-Format-Specifications)
  * [MIDI Files Specification](http://www.somascape.org/midi/tech/mfile.html)
  * [MIDI Beat Time Considerations](https://majicdesigns.github.io/MD_MIDIFile/page_timing.html)
  * [MIDI Timing](https://paxstellar.fr/2020/09/11/midi-timing)
  
  ## License
  
  MIT, copyright © 2022 Pierre-Emmanuel Lévesque
  