I was very surprised at the sheer quality of the effects on my QU-16, and haven’t really strayed too far from the default Reverb and Delay. Depending on the room, I’ll use a little of reverb and delay on vox, and a little reverb on kick and snare.
It’s worth spending a little time at home just listening to a vocal or instrument track and going through all the effects to see the ones you like, then set them up on FX1&2. Once you’re at your venue, just mix in and fine tune to taste.
FX1 – SMR Reverberator
FX2 – 2 Tap Delay (linked)
Hope that helps.