You're welcome !
The exact connection would be :
Sub out > VCA signal in
EG out > VCA CV in
VCA signal out > mixer
(You Can also find EG with integrated VCAS, like WMD Javelin, Cosmotronic Delta V, or the latest 4ms that looks dope !!)
You'll also need a trigger or a gate to start the enveloppe.
The role of the function generator here is to modulate the amplification of the audio signal going into the VCA.
Imagine a volume curve if you like.
Once the enveloppe is not triggered (sequencer stopped) your volume will stay to zero.
It's also interresting to put a low pass filter (vcf) between VCA and mixer.
Then you can modulate the filter with the same enveloppe (with a multiple) to give more dynamics to your bass sound ! :)
Hope it's clear, it's one of the tricks, but some folks here could give you many others.
I'm not a modular expert :)
I highly recommand voltage block ! ^^
Mimetic Digitalis is a very good option too, in reduced spaces.
Best,
Cédric