its basically to play chords in single osc. im bad at explaining or using english but i try with representation
you can select multiple notes and it will played automatically Together in the osc
its more versatile than unison stacks in advance tab
plus extra feature. you can use pitch to snap voice chords in the notes you selected in pitch.
so when you are disabling global snap in voices. when you played diffrent key it will move to that key ignoring scales. sometimes we want that and sometimes dont. so best way to do this is make it snappable with pitch section move up or down whilie snapping is chooseable in advanced tab