I recently put a set of regular light gauge D'addario strings on my Epi Thunderbird, and I still have to break them in to get an idea of their feel. What I'm curious is what exactly is the difference between a light string and a heavy gauge string, sound wise? Will I get a thicker sound? I've tried medium and it seems pretty meh. I haven't tried a heavy string yet, and I'm still searching for the best string that suites both my bass and I. D'addarios are cheap enough and I'm pretty satisfied with them as a brand. Thanks guys.