The actual effect depends upon the parameters. if phi and plow are both null, there is no effect, else, the pitch changes at each tick, cycling through notes n, n+phi, n+plow in this order (phi and plow in half-tones up) Previous Tone portamento effects will be forgotten, since a note value is needed.
Scrolling mode for no effect:
1 A-4
sample number/note
Scrolling mode for arpeggio:
1 A-4 B-4 A#4
sample number/note/arpeggiated note 1/arpeggiated note 2