Update README.md

Clarification of the diatonic circle of fifths.

Author: knchaffin

README.md

@@ -36,7 +36,7 @@ Each of the three parts is discussed following in more detail:
 
 Harmony is made up of chords made up of notes from the mode and root that is selected, as well as determined by the current circle of 5ths degree position chord type.  A harmonic progression is the movement on the circle in steps over time.  At the bottom of the Harmony sub-panel is the "Presets" control which allows you to select between 50+ ready-made harmonic progressions.  Each progression is made up of from 1 to 16 steps, designated by the Roman numeral degrees I-VII, corresponding to to the degree positions on the circle for the current mode and root.  I.E., the same progression can be played in any of the 84 mode and root "scales".  As the pogression plays, you can watch the circle and see which chords are playing for each step.  Each preset has an initial number of "steps".  You can manually reduce the number of steps via the "Steps" knob, but you cannot increase it past the max value for that preset. The minimum number of steps is 1.  Sometimes some interesting music can be created by setting the steps to 1, in which case the harmony stays on the root position of the circle, but may still meander through inversions and the melody and bass will follow.
 
-The music theory behind the circle-of-fifths is beyond this manual, but the basic theory is that triad chords next to each other on the colored part of the circle always share one note between them.  Each degree going CW around the circle represents a 5th interval, thus the name circle of fifths. Going CCW, the interval is a 4th.  The shared note between two chords going CW is a 5th above the tonic or root note of the first chord.  Basically, the further away from each other two chords are on the circle, the more dissonance there will be.  A common progression is to start out on the I position and then jump several positions CW on the circle and then walk back CCW on the circle back to the I position.  Each step CCW gives a feeling of resolution of tension back to the I position.  There are a myriad ways to form the progression, but there are a few progressions that almost all popular western music is composed of.  Meander has 50+ such presets.  One of the most common progressions in popular music is I-V-vi-IV , which is #26 in the presets.  That same progression can be played in any of the 84 mode and root combinations, but may have s distinctly different feel in a different mode and root scale.  Not all music is based on chord progressions, but a lot is, particularly popular music.
+Technically, Meander uses the "diatonic circle of fifths" rather than the "chromatic circle of fifths". The 5 degrees of the diatonic scale are designated in color on the Meander panel, whereas the 5 remaining degrees of the chromatic scale are rendered in gray. The music theory behind the circle-of-fifths is beyond this manual, but the basic theory is that triad chords next to each other on the colored (diatonic) part of the circle always share one note between them.  Each degree going CW around the circle represents a 5th interval, thus the name circle of fifths. Going CCW, the interval is a 4th.  The shared note between two chords going CW is a 5th above the tonic or root note of the first chord.  Basically, the further away from each other two chords are on the circle, the more dissonance there will be.  A common progression is to start out on the I position and then jump several positions CW on the circle and then walk back CCW on the circle back to the I position.  Each step CCW gives a feeling of resolution of tension back to the I position.  There are a myriad ways to form the progression, but there are a few progressions that almost all popular western music is composed of.  Meander has 50+ such presets.  One of the most common progressions in popular music is I-V-vi-IV , which is #26 in the presets.  That same progression can be played in any of the 84 mode and root combinations, but may have s distinctly different feel in a different mode and root scale.  Not all music is based on chord progressions, but a lot is, particularly popular music.
 
 The fBm fractal noise results in harmony (chord) meandering, by allowing chords to wander over a range from a fraction of an octave to several octaves.  Rather than meandering in octave jumps, the chords meander through chord inversions across one or more octaves.  The playing chords shown inside the circle are in inversion notation if inverted.  If you see a chord such as G/D, that means a Gmaj chord where the G root is played above the D note in the major triad.  These inversions also allow the chord progression around the circle of 5ths to sound less melodic.  These are also two of the reasons that musicians use chord inversions.