I have the Boss RC-30 looper that has an XLR input and I've been experimenting with guitar pedals to spice up vocal and percussion loops. Most pedals are terribly noisy but for some reason Digitech Nautila, Obscura and Polara are quiet and sound great. What might be the reason for this? Originally I thought about putting my Ibanez LF7 LoFi first and then a delay and a reverb. The LF7 sounded great but the noise didn't. All gain pedals are really noisy, even when turned off. Do you have suggestions? Have you ever used guitar pedals with mics? What have you learned? What works and what doesn't?