hi Aaron,
There's plenty of EDP examples at www.andybutler.com.
(probably more than you want)

One thing you can't do with a single EDP is play a loop at half speed against one at normal speed.
The EDP only plays one loop at a time at normal speed or half speed.
However what you can do is drop the loop down to half speed, overdub, and then got back to normal speed, this leaves you with the original loop at normal speed, and the overdub sounding at double speed.
The EDP edit functions don't include pitch-shifting, filtering or any sort of effect. Rather it's like editing tape loops together, but in real time.

Typical edp functions are Replace, where the loop that is playing has a section replaced by live sound, and Insert where the live sound is edited into the loop, making the loop longer.

The edp multiply thing I'm using a lot of these days is like this:-

1)record loop
ABCD
2)multiply loop
ABCDABCDABCDABCDABCD
3)edit loop with Replace
ABCDABCDABCDABCDAECF

hope that makes sense, the loop is "multiplied" into a longer loop containing repeats of the original, then the rigid repetition can be broken up.

The term "Multiply" is used in a number of looping devices, e.g. Repeater and Looperlative, as well as with the edp, and while the implementation differs in each case the term is always used to describe making a loop longer by adding together repetitions one after the other.
Indeed, a lot of people think that if you have multiple tracks with the facility to make new loops that are an exact multiple in length of the original then you don't need an EDP type "Multiply", so whether you implement something like that in your software is not exactly a burning question :-)