Glide
Glide is the time a new note takes to slide to its pitch. On Heisenberg and Space, mono and legato glide when notes overlap. Poly glides when they do not.
Glide, or portamento, is the time the pitch takes to move from one note to the next. At zero, the pitch steps. A short time is a bend between two notes you can still hear. A long time arrives at the second pitch late.
Heisenberg and Space decide which notes glide from the voice mode. In mono or legato, overlapping notes slide, and a note that starts after the previous one has ended steps. In poly, overlapping notes are separate voices, and a note that starts in a gap glides from the previous pitch. If glide time is above zero and you hear no slide, the notes are on the other side of that rule. A connected bass line is a run of overlaps, so it needs mono or legato.
On Space, legato also skips the attack. The voice keeps its current envelope and the pitch slides to the new note.
Pulverisateur only exposes the time: how long a new note takes to reach its pitch. Mono cuts the note already playing. Polyphonic lets the notes sound together.