fix: classic polysynth example produced no sound without host automation

[SpotlightKid]

Sorry, I just realized that the example patch produced no sound when either loaded into a stand-alone version of Cardinal or the host doesn't set the mixer levels, which were connected to the "Host params" module.

Fixed by removing these cables. Also adjusted VCA envelope and filter a bit.

[dromer]

Yeah it's tricky. On the one hand it's good to showcase the host-params capability, but if you run standalone there is (currently) no way to control those parameters.

[falkTX]

shouldnt the host params module be removed too in that case?

[SpotlightKid]

shouldnt the host params module be removed too in that case?

I see you already merged it, but I think it's good to leave it in to make it easier to setup host automation.