vimsynth/modules/slew
modules/modulators/SLEW
Smooths a signal: a rise time and a fall time, separately. Three things at once — portamento on a pitch, a smoother on a stepped S&H, and a cheap attack/release envelope if you feed it a gate.

SLEW to get this card.Down the left edge of the card, top to bottom.
Down the right edge, in the same order.
Left to right across the face — the dials in the picture.
The full reference — every parameter curve, the patching notes and the worked examples — lives in the manual: docs.vimsynth.com/modules/slew. In the app itself, :help SLEW opens the same page without leaving the rack.