Rig: jazzmaster --> catalinbread belle epoch --> princeton or blues cube (both played with their own reverbs) Here it is: I don't think I've discovered some unrevealed truth but I think we never say it enough. If you add an echoplex preamp in your signal chain, clean sounds and crunch get better. Clean sounds: my guitar gets more resonance. A wider panel of frequencies are involved and it seems to become alive and intense. It's true for an electric guitar but it's especially true for acoustic guitars and hollow bodies. Crunch: the attack is more powerful. I also observe that my intentions are more obvious. It's especially true in my case as I play with my fingers and there's no overdrive in my pedals. I keep the amp clean and it breaks up if I decide to play my guitar more powerfully. Well, that's all I wanted to say. I'd love to read your opinion on the topic!