When I started using my Model 12, I was plugging in and out of each channel as I record to it Then I dug out a Tascam PB32W patch bay (half 1/4, half RCA). I had to re-learn how patch bays work ( normal, half normal, through) I also have a few older rack effects which were underutilized. My solution was to use the patch bay as a throughput, meaning I just use the upper row of connectors from the side that face me. In this way I can patch my instrument to an effect input. I can patch the effect output into the back of the Model 12. Then I had another brainwave. I connected all the model 12 inputs to the upper row of my PB32, RCA patch bay. Now, I do not have to plug and unplug from the 12. Instead, I can use the patch bay to connect an instrument to an effect, and in turn connect that effect's output to the input channel of my choosing on the 12. I admit it is a rat's nest behind the patch bay, but it is also out of sight. So far it works for me. Bottom line, a patch bay is a very handy accessory for the Model 12. Recommended!