well someone will first ask you if you checked your switches for instrument / line level settings correct…
what i've noticed is some effects seem to drop the volume others actually make it louder, probably by nature i'm assuming, like my phaser seems to drop the leve, chorus is a slight boost, depends where intensity knob is mostly though, i'm not sure how intensity works, i'd expect it to be like a dry/wet like the time factor has but i don't think it works that way on some of my presets with intensity at 0 it sounds same as it does in bypass but others the effect is always there even with intensity at 0
i'm not sure i would like the sound better but i would like maybe an option for having the intensity mode be a dry / wet mix knob most the time i just want to dial in subtle effects and keep my signal fairly dry