Big wet and splashy. 60’s outboard spring reverb tank. Being an old school effect, tank reverb units were invented before effects loops etc. Had the Topanga been invented before the spring tank units, players would have put the pedal in front of their amplifiers and as close to the front of their pedal boards. You should look at your Topanga as a sort of ‘pre-reverb’ type pedal, putting only fuzz boxes in front of it allowing splash, crash, and drench everything downstream.