Moving depends on several things for me. First if the wind is blowing I may call in 2 or 3 different places, the wind will carry your sound just sometimes not were you want it to go. Also on how much land you can hunt on that particular track. I have 200 acres out in Milton and I will call in 2 or 3 different spots and have good luck doing so. If nothing I move to another property and start the calling all over again. I do use MP3's here are some websites that I use, besides my foxpro sounds. I like to hunt in the mornings, I try and get setup 30 or so minutes after daylight this gives the coyotes plenty of time to get back their dens from hunting the area. Coyotes will feel comfortable going back just after daylight since they were there not that long ago. As for evening the only downside is I have called and called until legal shooting hours were over only to get up and pack everything up and the coyote decides to come in after dark and I get busted. Coyotes are smart and can become call shy. They will associate your calls with you and may not come into those sounds for a long time, thats why I try and switch up sounds to kinda confuse them.
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