I've been using a Fulltone '69 at the end of my overdrives and fuzzes. But it doesn't seem to really give as much volume--it feels like there is a little bit of "ducking" (perhaps?) I have heard a little bit that they don't like buffers, so if another in front of it is not true bypass... could that be my problem? Where do you all put yours? This is my chain... Zvex Super Duper 2-in-1 --> Line 6 FM-4 --> EB VPJR (To Tuner) --> Klon Centaur --> Crowther Hot Cake --> Zvex Fuzz Factory --> Crowther Prunes & Custard --> Fulltone '69 --> T-Rex Replica --> EHX Deluxe Memory Man --> Frantone Vibutron --> EHX Holy Grail Reverb Would any of that effect it?