LOL.... I asked this question on our facebook group and got about the same response. I honestly believe it has to do more with guys not wanting to give away their trade secrets... they put a lot of time and energy into learning this skill and I think they don't like just handing it out!!
I've put down more coyotes than I can remember and still doing fine, so I'm not too concerned about "trade secrets"... though in some ways... the guys are right. It depends on a number of variables that make it difficult to just lay it out... but I'll try.
For this time of year... if you have lots of food sources for your coyotes... and the temperature is not yet down... then they are less apt to come into prey distress. Why... because they may already be well fed. Plus... it's the most common sound other guys use to try to get coyotes to come in.. especially those that don't have a lot of experience. So.... knowing this, I generally start out my sets this time of year in these circumstances using a lone coyote interrogation howl... either male or female. I listen for responses. I use a lone howl because sometimes group howls will make a single coyote in the area nervous... and less likely to come in.
If I got a response from the interrogation... and they are at a distance... I generally follow up with cottontail or jackrabbit distress... Run for a minute... stop for 2 or 3... run... stop. If I don't have any takers by about the 10 minute mark... I switch over to a single coyote challenge barks... I run it for less than a minute. Then I wait about 30 seconds to a minute and hit fox distress. I run this about a minute... go 2 or 3 of silence.. and hit it again. I don't run this more than a couple times.
Generally, .. I've got recalcitrant coyotes curiosity... IF I spot a coyote or coyotes coming in... I'll wait in silence. If they check up... I'll hit vole squeaks fairly quietly.... but I'll increase the volume until I see them head swivel or move towards my call.
Each season works a little different. In the winter... when the temp drops... coyotes caloric needs increase dramatically, and game is less available. Using cottontail distress tends to work good, as well as jackrabbit (even if you live in an area with no jackrabbits). My sequences tend to revolve around distress sounds primarily so no need to go into that.
During mating season... Mid-late Jan through Feb.... female howls and whimpers tend to work well... and if it's still cold, rabbit distress also keeps them coming in, at least in my neck of the woods.
Late Spring/Summer.... I typically will start out with a female coyote interrogation, followed by single female challenge barks... followed by pup distress. This tends to give me the best results.
Some guys like the bird distress... and I'll break things up occasionally with woodpecker, etc... and I also do vary up my sequences depending on where I'm hunting, if I've been there before, etc, but I don't have the time to lay out every possible option that might present itself in the field.
The cool thing about coyote hunting is that it is a little like a game of chess... I try a number of things and sometimes I'm on a stand longer than the average joe, either because I got a response from my interrogation that is a long ways off... and I'm unable/willing to close the distance, or because I'm checking various sequences to check their effectiveness.
Last thing I'd mention. Call Volume.... I always start quiet... and increase volume during the first few minutes (with the exception of interrogation howls and challenge barks... I keep those loud). And... when I'm running any kind of distress... I manually increase and decrease the volume on my call (up for a 4-10 seconds... down for 4-10 seconds)... as it creates a more realistic sound than just running it a flat 35.... or flat 25 volume setting.. .etc. If the wind is strong... I don't worry about fluctuating the volume.. the wind takes care of that for me.
That's about it for me... Each area will give you different challenges, but there's some generals that seem to work consistently from year to year out here in Idaho.
Good luck man.