|Melody tracks are also created based on
chord progression. In this process, the contents of the
Harmony track and the Rhythm track are not referred to.
Each theme is processed at a time.
The Automated Composing System uses some algorithms to
produce melody line.
First, a line is determined for the theme using Lagrange
polynomial. It is easy to understand if you imagine a music
score and drawing a line on it. For example, if [theme-A]
contains 4 measures, a line of 4 measure length will be
drawn on the score. This can be done using Lagrange
polynomial and random numbers.
|Next, the rhythm of the melody line is
determined. For example, a combination of 2 eighth notes and
3 quarter notes fills a measure.
|Assigning the rhythm into the Lagrange
polynomial makes a melody line. However, this melody line is
|The temporary melody line includes notes
that are not on the music scale. Notes that are not on the
music scale and dissonant notes to the chord will be
adjusted using another database. Dissonant notes can be
changed into consonant notes if they are shifted a half note
above or shifted a half note down.
|This process is repeated if there is more
than one melody track. The Sub-Drum track is also created
using this routine internally.