You still miss something. You always MUST have two VCAs to use velocity on the signal level. It does not matter, whether the velocity controlled VCA works DC coupled and manages the level of the envelope or whether it works AC coupled and manages the level of the audiosignal.though I still believe that it would be necessary to adopt a VCA with «two» cv inputs, that is to have two control voltage inputs on the VCA module in order to modulate the amplitude through both EG and velocity voltages. Or there's a step I missed in the understanding of the patch? Maybe you just intended to mix the two signals...
You may have a look at
http://www.doepfer.de/a100_man/A132_man.pdf
page 4, left example
Florian