I currently have my Mosky XP Booster (a very inexpensive Xotic EP Booster copy/clone) in front of my other drive pedals, and it is almost always on. I keep it set very low, and I find it drives my other pedals/amp mildly, but in a really nice way - it just adds "that something extra". But today, I tried the XP Booster AFTER my drive pedals. Actually, I have two of them, so I was able to place one in front as always, and the second one behind the drive pedals. This allowed me to switch between them, and try with both, etc. This little miracle pedal never ceases to amaze me. Always on in front does something very nice to my tone that is hard to quantify. But using it after my drive pedals is quite amazing. It thickens things up a bit, but without mud. And it gets louder without being "driven" by the pedals in front of it. I guess it has lots of headroom. All I can say is - wow. Now I am torn about where the XP Booster should sit on my board. I have two of them because I have two pedalboards - the second one is not meant for this board. I'm not really sure I want two of them on the board anyway, but it was pretty magical before and after. Where do you keep your EP/XP/other "Echo Plex type" boosters in relation to your other drive pedals, and why?