Yes, i COULD just do what works best but thing is I have treid both ways and i'm not sure. So rather than wait for several band jams to get a better idea of which way works best i thought i'd see what others think Never been much of a pedal guy either so those wo are probably know better then I. It will just be a board with those 2 pedals and nothing else, but the way they will be mounted will not be easily swapped for reasons too long winded to go into. In any case the point is i wanna see what others with the spark boost and a tube screamer that use them like i do think regarding the best position to run the, The park will be an always on to just bump the gain and tone a slight bit for models that have too little gain or need tonal adjustments the amp doesn't accomplish well on it's own. The tube screamer will be used with the drive on zero and level up for a clean boost to drive the amp harder for liquid solos. Amp and spark set for classic rock degree of gain. My thought is spark first and screamer last. Just wanna see what others thing before i mount them on a board. No other effects on the board.