The Harmony line operates most conventionally
in Classical Mode. The notes in your piece (with the exception of sixteenth
notes) will be altered to fit the current chord, which by default is C Major.
Local harmonic gestures (smooth curves
in the Harmony Line) will create standard progressions from
the chord of the tonic (I) to the chord of the dominant (V or vii) at the junction
of the green and blue shaded background regions. The music will then resolve
back to the tonic by the end of the blue-shaded region.
Modulating gestures (spikes in the Harmony
Line) will create a chord progression which modulates, again
via standard chord progressions, to a new key determined
by the height or depth of the spike.
The precise tonal path of these progressions is a function of the width of the
spike or duration of the yellow-shaded area.