I have a cheap Ibanez DS7 and a Big Muff Pi (Russian). I've noticed that when I have the tone high on my Strat, the DS7 creates a lot of noise, especially when I run my fingers along the strings. However, the Big Muff does not do this. Along with creating noise, the tone gets too trebley. When using both tone knobs on the Strat at 0, the DS7 sounds better, but when the pedal is turned off, the clean sounds ugly. Does anyone know why my DS7 does this and if there's anyway to correct it?

Thanks.