To setup the FX2000 within the mixer's aux bus, do the following:
1.) Plug a cable from the AUX send on the mixer to the INPUT 1 on the FX2000 (if you have two AUX sends on the mixer, use two cables-one from AUX 1 to INPUT 1 and AUX 2 to INPUT 2).
2.) Connect cables from OUTPUT 1 and OUTPUT 2 of the FX2000 to the AUX returns of the mixer.
3.) Press the SETUP button on the FX2000.
4.) Use the second small encoder from the left to choose MONO if you have 1 AUX (or STER if you have two aux channels into INPUT 1 and 2).
5.) Use the third small encoder from the left to choose EXTN.