effects

For the Soundcraft GB4 you have to use an external effects device. For us

it is the Behringer effect unit mounted in the rack.

Looking at the picture below notice the AUX 5 knob is labeled REVERB. This

controls how much of the signal is sent from that channel to the reverb unit. It is 

setup to send the reverb sound back to the main FOH speakers.

There are a ton of built in audio effects in the Yamaha mixer we have in the booth.

There no "quick" way to get into adding effects into a mix, other than reading the manual.

Start with downloading the PDF manual for the mixer below, then go to page 57.