Surprisingly I found little information about common practices for this scenario... Stereo effects such as panned ping pong delays offer the opportunity to modulate the delayed signal down a separate path in the effects chain. I have no interest in running stereo amps (nearly all house sound is mono anyway). So what are people using to combine the two signal chains further down the line as I want both to combine before my preamp? (it would have to anyway cause it is a mono input on my preamp). There are obviously products that work will (like an ABY box or Loopmaster splitter - reversed), but I was curious if there is a standard protocol or more common/appropriate tool people are using.