vimsynth/modules/out
The speakers. Exactly one per patch, and it is the only path to being heard. r normals from l, so a mono patch into l alone comes out of both ears.

OUT to get this card.Down the left edge of the card, top to bottom.
l, so it only needs patching for a genuinely stereo source.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/out. In the app itself, :help OUT opens the same page without leaving the rack.