pedal troubleshooting

I have an MXR Pre-amp that when turned off, has a weak signal coming out of the amp, but when engaged sounds completely normal. Anyone had the same problem before? It’s the only pedal I run through my amp at the moment, I’ve tried different cables, 9Vs, different amps. I feel like it has to do...

You'll have to forgive me if anything I've done here is a noob/beginner mistake, I'm still trying to figure out all the ins and outs of pedalboards. As the final pedal I've bought for my Boss BCB-60 Pedalboard, the 105Q had me very excited. I played with it for most of today, and got quite...