I'm having some real difficulties with some of my new pedals and gear, playing with a new heavy alternative rock band. A lot of these pedals I haven't used much except for recording, and they are acting.. erratically to say the least. My current setup is like so: 90's Jazz Bass Plus 5er (Active, with a passive mode), MarkBass SA450 through a Mesa Powerhouse 1X15 cab. The pedal setup is this - > Zoom B2.1u (used mainly for EQing, though I am thinking about pulling it altogether) -> Boss LS-2, with 2 seperate loops. Loop 1: Ibanez PD-7 Phat Hed -> MXR Blowtorch Loop 2: Ibanez SB-7 Synth -> Boss OC-3 Last night I traded in my LBM for the PD-7 because the LBM was just too damn noisy and lacked the cut-through for the style of music I am currently playing, which is very heavy on guitars .. not a lot of sonic room for me to play with on bass. Anyway, the issue is that I am getting insane feedback, mostly from the PD-7 and SB-7 (and also from the LBM, when I had it..). Like the high squealy kind, as soon as I engage the pedals. It seems to stop once I start playing, but as soon as I stop it is back with a vengeance. If I turn everything down I don't get it anymore, but then I can't hear myself playing, and even at the point where the feedback makes the pedal unusable, it still isn't that loud (at least not relative to the rest of the instruments, which are, admittedly, very loud). The room that we are playing in is quite small, just big enough for the four of us and our amps, basically. At the moment, my amp is sitting between the two guitarists' amps, which are pretty big and loud, and I am standing across from it. The volume level is very high.. and I am wondering if the problem may be the result of so high a volume in a little space like that, but the feedback happens even when nobody else is playing.. I just turn on the pedal and BANG - instant squeal. I guess I need to understand what exactly would cause feedback in this situation, and how I can fix it and still be able to use my pedals in this situation. Help!