I'm barely past the basics of guitar playing and completely think I'm better served to continue to practice practice practice (which I do daily).........but I can't just stop there. I've caught the bug and wanna expand on my new found passion. This week I'll pore over Sweetwater's amp page drooling over modeling amps.....next week it'll prolly be the tube amps. Pure goofiness I'll admit, but my bet is many of you have been there as well. Having experimented with a couple of modeling amps and enjoying their presets (except heavy metal.......yuck), I've firmly established my default go to tones are tight defined Fender-esque cleans. My question.......if I purchase an amp that primarily produces clean tones (i.e, Fender), which SINGLE pedal type (I'm a long way from wanting a pedal board) would I choose to produce the classic/southern rock crunch at lower than crazy volumes. I read and research your terminology but am still ignorant. What is the best single effect I'd want to expand the capability of a primarily clean amp......gain, overdrive, distortion, compression, boost?