If you are using a pdeal designed for a guitar, be very careful abotu feeding it too much level! Send it -50 or -30 and use a DI to feed it back into a mic input.
Personally, I find the internal FX are just fine, don’t see why anyone would want to put a low level, low quality pedal in the circuit. Usually they go after the guitar and before the DI.
Have you explored the internal FX? FX 3 and 4 can be assigned to a single channel as an insert, and there are some very good echo effects.
Remeber, this is digital and can do anything!
😉