TC Electronic Ditto X2 Looper - Manual (Page 8)

Setup examples
Ditto X2 Looper English Manual 6
Setup example 2:
Ditto X2 Looper and effects
Place your effects before Ditto X2 Looper. This
will allow you to create and record different
sounds within the same looping session simply
by switching your effects on and off.
Modulation
Pedals
Combo
Input
Drive
Pedals