Hi Newvin,
It might be useful if you could provide your link with your rack that you are using regarding the above mentioned case, so it's easier to troubleshoot the problem.
Talking about troubleshooting, did you troubleshoot this, starting from the beginning and then step by step going there where you are now with your sound? What I mean is, start first just with that plain VCO, see if it behaves as you expect it should be, then do the next step, break the sound-circuit from the VCO to your output module, is it directly quiet? Then the next step, add the next module of your above descriped setup and check again: does it behave the way you expected it? Then abruptly break the circuit and see if it's directly quiet. Keep repeating this with adding step by step the modules you are using till you found the problem, and then solve that where you found it :-)
That might be a long road to go but it helps you in understanding exactly what's going on where on the road of sound creation, if you get my point?
Good luck with the trouble shooting and if nothing goes or helps, provide the link of your rack (and additionally perhaps a patch overview) and tell the exact setup, perhaps then it's possible to trouble shoot it for you.
Kind regards, Garfield Modular.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads