A voicing is the specific way a chord is played. It includes whether or not a chord is inverted, using voice leading, duplicating or omitting particular notes, or the octave displacement of voices.
Simply put, a voicing is one of a near infinite number of harmonic expressions that can be used to imply a chord or scale.
In Cymasphere, voicings are generated by playing cymatics, which generate voicings using the dashboard settings.