Importent is also, that u set Input impadance to 3,5 MOHM, Output to Direct, Input to Guitar and 2. Varriax
also ever put the FX Block after the Mixer (Pan A and B to Center and both + about 3-4 dB). let the Fx Return/Send at 0 dB Set Line/Amp switch to Amp ant Stomp/Line Witch to Stomp
thats basicly, what works the best for me