My bass (a Birdsong) has two volumes and a Vari-tone. I've been thinking it might be really cool to install individual tone controls stacked on the volumes. That way I could have the neck pickup on a real low dubby sound and the bridge pickup more trebly, and I could switch between the two or perhaps blend the two tones? Although in my searching on the subject, it seems the general wisdom is not to have two tone knobs, as it puts them parallel to each other? Whatever that means. I really don't know, could someone walk me through why this would or wouldn't work?