modulation.md

• Home key set at start

WHEN TO MODULATE CHECK:

• Modulation check for each letter (A,B,C,D,etc) Will effect every application of letter.

  • if yes, modulation every instance of letter in relation to home key
  • 1 in 8 chance to modulate on letter
  • Determine type of modulation
  • parallel key modulation
  • relative key modulation
  • neighbour key modulation
  • near key \ foreign key modulation

• Modulation check for each instance of letter

  • Truck driver modulation
  • Shift up or down a certain amount of semitones
  • 1 in 20 chance modulation
  • markov chain check for odds update and type

TYPES of Modulation:

• PARALLEL KEY MODULATION

  • Shift Major/Minor key on same tonic root
  • May require last chord of previous to be set to a pivot chord. Pivot chord may be tacked on at end of progression. (ii - IV :| V :|)

• RELATIVE KEY MODULATION

  • Shift from Major to Minor, or vice versa to the relative key of opposite mode.
  • For Major key, take tonic and move down 3 semi-tones. For Minor, take root and move up 3 semi-tones.
  • The vi in major is tonic in relative minor
  • Use pre-tonic (V, IV, ii) chord to get back to Major from Minor

• NEIGHBOUR KEY MODULATION

  • Shift to keys next to home key in circle of fifths.
  • VARIANT: Shift to neighbour and change mode

• Near-Key Modulation

  • Shift from home key to key 2 steps in either direction away in circle of fiths
  • Shift from home key to key 3 steps in either direction away in circle of fifths

• Foreign-Key Modulation

  • Shift to random key.

• KEY SHIFT or Truck Driver (half or whole step up or down)

End chord of previous section may have to be altered to a pivot chord in case of modulation

Modulation Types:

+1 (half-step up) -1 (half-step down)

+2 (whole-step up) -2 (whole-step down)

-3 (major to minor) check key state +3 (minor to major) check key state

±3 to ±11

PIVOT CHORDS

• Check if secton modulates. If yes, add pivot chords at end of progression.
• ALT: if section is only played once, replace last chord of progression
• Check the type of modulation used. Each section has it's own pool of pivot chords
• Print pivot chords as ||: I | IV :| V :|| x5