I recently added a couple of distortion pedals to my board (Pro-co Rat 2 and TC Electronics Rottweiler). I previously used my amp's footswitch to go between clean and dirty but wanted to add a bit more variation to my tone. However, when I use a modulation pedal (I have a Boss BF3 Flanger and EHX Slammi pitch shifter) with either of my distortion pedals switched on, I get a huge jump in volume. I don't mind a small volume bump but this is really extreme. Neither of my modulation pedals have a volume control. I don't want to turn my amp or guitar down as then I'd be too quiet when the pedals are switched off. Does anybody know how I can solve this problem? Would it help if I added a compression pedal or are there any mods that I could do to the Slammi and BF3. Any advice would be greatly appreciated.