OK! Humonica, Hammer and Chord, Soft Bell and Cross-Polyphonic FM now have
legato/portamento support.
(
audio demo 1,
audio demo 2)
You can configure these and a couple of other parameters in the new "config" screen:
There are two legato modes, both for monophonic lines. "Retrigger" means it closes the old note and opens a new one, bending the pitch (with optional portamento) so that they match. "Glide" doesn't trigger a new note, it keeps shifting the old one around.
The portamento control in the "Legato" section determines which notes have portamento applied. By default, only overlapping notes have portamento applied (if it is enabled), but it can be set so that all notes have portamento (from the most recent note).
EDIT 2018-06-13: added latency/anticipation to (some of) these. With legato enabled, this means the previous note changes slightly before the new note starts. This can gives a more natural transition, particularly in Hammer and Chord.