I use a Lehle 3 at 1 pedal.
Magnetic PU > lehle input 1
Piezo > lehle input 2
Nylon (other guitar) > lehle input 3
Lehle output > kemper input
The kemper manages lehle inputs and outputs via midi
In the piezo and nylon presets I insert a loop mono. Loop send > D.I. Box > P.A.