I start out with low volume rabbit distress or low volume pup distress. Usually play it for under two minutes at first. I then play the same volume for about 5 minutes. If no response I will jack the volume up for 30 seconds or so then curt it back to the previouse low volume. I usually only stay on stand for 20 minutes.
If a critter responds and closes in on the call, I just let it play. Once they hang up, I will play around with volume level fluxuations.
When using bird sounds, I play at 3/4 volume for about 30 seconds, then cut way down on volume.
Also, I use a rabbit style exe decoy on daylight sets. Place it and e call together.