there’s been a time when t.w.z. audio path was so much simpler than it is now.
not only a (small) mixer within this frame clouds the whole wiring thing, but with paths that can be mixed together, what really happens is mostly beyond what a static drawing can explain.
to complicate the drawing just a tad more, after about 45 years since i started playing i’ve finally discovered why the only distortion i can stand is someone else’s, and i’ve always only despised distortion onto my guitars or basses: i can’t take it as a whole with the instrument feed, i can only mix it in, and partially, in a very modest quantity, containing maybe even the fiercest and nasty-est distortion, but only mixed it with plenty of clean signal.
which results in the lehle parallel m just acting as the strymon riverdrive’s blend control, while it’s the darkglass bk7 ultra that comes stock with such blend (and taught me why i never liked distortion on my own voice).
despite boxes not being precisely framed as in the past (because of the wiring, like in real life), the beauty of an audio path diagram like this is, you’ll find you way around it when you’re designing sound, your own signature.