loop circuit causes volume drop... why?

hey all, here's a diy circuit i made so i can use a reverb as like a freeze. when activated, the switch cuts off input to the pedal but allows output to continue. I am a SUPER noob at this stuff, so if this is completely jank, let me know.

for some reason, when engaged, the pedal in the loop has a serious volume drop. when i disengage, the pedal returns to full volume. i can post a video to show what i mean. i also have included a diagram of my circuit.

thanks!

 

do you have a diagram or schematic of a simple one? thanks!