I was very curious if this could be done. And honestly, believe colorized connectors (showing env~) should be a feature, and, if not that then, a plugin cursor that lights up according to env, or possibly even value. (But, alas, alack, making plugins is not (yet) in my mission statement).
So, for now, this points in that direction.
Enjoy. May it serve you well.
Peace through Pure Data.
A movable, autoconnnecting vu meter;
esp. for debugging code;
requires: iemguts, cyclone, that dsp be on, and that the [namecanvas watchmvu] object be added to the patch that you want to investigate.;
Once setup and the abs is added, switch to Edit Mode, and left click and drag the vu meter over any audio objects and let it rest over the top-left-most corner of the object..;
The meter will autoconnect to that object's first outlet~. If you move it away (>25px) it will disconnect.;
I.e. allowing you to track and investigate the audio flow~ within your patch.