Hey all. So I was using my friend's Orange Terror bass head, and was getting a lot of hiss. This was when my pedals (2 of them new) were plugged in but nothing was engaged. I then tried to plug the bass directly into the amp, and the hiss was much quieter. Now I know this is a noisy amp to begin with, but the change in hiss volume was noticeably different. Now forgive me for not being the most technically knowledgable fellow around here, but where could this hiss be coming from? I find it strange that the amp was getting this noise even with all of my pedals shut off. FYI, my pedals are Boss tu, Boss OC2, Mxr M80, Boss CE5, Boss DD5, Boss RV3, and Sansamp powered by Voodoo Labs PP2. Thanks in advance!