So I'm trying to figure out a volume boost for solos. I built a lpb-1 clone to put in the effects loop of my engl for a huge clean boost, as the 'solo boost' built into the amp does hardly anything. I tested the boost through my at home rig.. an old marshall 3203. it was exactly what i needed, and literally just about probably doubled my volume if i maxed the pot.
then i get to band rehearsal to try it in my actual rig.. my Engl. and it doesn't work. no matter where i set the pot (volume knob), the volume was the same, and it was slightly lower than if I had the effect switched off. I thought maybe the pedal broke.. but I threw it in front of the amp and the volume knob was working again. So what's going on that its not working in the loop? I need a way to boost this.