I'm in the process of redesigning the preamp in an amp i built to resemble the lead channel of the SLO. At this point the OD is quite nice, but i fear this design is not as good as i need as far as it's ability to get chimey and clean when you roll your volume on the guitar down which is how i get my cleaner tones. I have the gain set so it's not real overdriven, just where i kept it at before i redesigned it. And then it cleaned up really nice. I'm just trying to determine if it's worth proceeding because it's not at all exactly like the SLO, it;s just in the same basic form with 4 stages including a cold bias stage. If the SLO does clean up well on the lead channel I;d be more inclined to carry on and bring it closer to the same spec. But if not i don't want to waste my time because i absolutely need those roll back cleans. I mean, it DOES do that but not as well as it did before i started redesigning the preamp.