That would only apply to chords though?
If you wanted to have a single saxophone play a 3rd or a fifth over your single note lead it would work?
No, the GR-55 does not have that capability, it cannot be set to play a 3rd or a 5th, it can only be set to transpose. In other words, you can set the GR-55 to play a note 4 steps above the note you are playing.
Here's the way it's explained in the GR-33 Owner's Manual as it relates to the diagram I posted:
The difference in the results of the two methods is shown by
the arrows in the figure.
The harmonies produced by parallel transposition may
sound odd at times. The place on the scale where this
problem occurs depends on the key, whether the key is major
or minor, the interval between the main melodic line and the
harmony, and so on.
The GR-33’s Harmonist uses what it knows about the current
key—which is already set in the patch—to continuously
adjust the harmonic intervals between the guitar sound and
synth sound, or between the 1st and 2nd tones, creating
The GR-33’s Harmonist also fully supports chord play. This
means that complex chords can be created by playing a
simple three-note chord, greatly reducing the chances of
fingering mistakes during difficult performances.