PRS is a guitar, I have an ordinary guitar cable from the guitar into the TF. I have a multicore from pedal board to the amp bit I am just going simply from guitar to amp in this instance ? to see why the efx is so strong ,I would have thought hitting green on the mix led would be the correct signal level and then adjust return level on my amps efx loop to taste but it does not get anywhere near there without being unusably strong with delays feeding back as if they are set to 100% .