Four VCAs on one card, each with its own output and its own CV — a drum bus's four voices, each under its own envelope, without four separate cards. mix sums all four as well, for whenever what you actually wanted was a four-channel mixer with CV over every level.
QVCA on an empty rack — 32×18 cells, knobs at their defaults. Press a in the app and pick QVCA to get this card.
inputs
Down the left edge of the card, top to bottom.
○1 inaudio
Channel 1's signal.
○1 cvcv
Channel 1's level. Normals to 1.0, same as a lone VCA's own cv.
○2 inaudio
Channel 2's signal.
○2 cvcv
Channel 2's level. Normals to 1.0.
○3 inaudio
Channel 3's signal.
○3 cvcv
Channel 3's level. Normals to 1.0.
○4 inaudio
Channel 4's signal.
○4 cvcv
Channel 4's level. Normals to 1.0.
outputs
Down the right edge, in the same order.
○1 outaudio
Channel 1, alone.
○2 outaudio
Channel 2, alone.
○3 outaudio
Channel 3, alone.
○4 outaudio
Channel 4, alone.
○mixaudio
All four channels, summed — a four-channel mixer with CV over every level, for whenever the four separate outs are not what you actually wanted.
knobs
Left to right across the face — the dials in the picture.
1 gain0 … 1= 1
Channel 1's level, when nothing is patched into 1 cv.
2 gain0 … 1= 1
Channel 2's level, when nothing is patched into 2 cv.
3 gain0 … 1= 1
Channel 3's level, when nothing is patched into 3 cv.
4 gain0 … 1= 1
Channel 4's level, when nothing is patched into 4 cv.
more
The full reference — every parameter curve, the patching notes and the worked examples — lives in the manual: docs.vimsynth.com/modules/qvca. In the app itself, :help QVCA opens the same page without leaving the rack.