"Se pale pou ta pale ave li" What's going on with "pou ta"

In that sentence, try to concentrate on "SE POU" which means  let's, must, (indicates necessity, obligation)
as in:
Se pou w marye - You should marry
Se pou w manje pou pa megri. - You should eat so you don't get skinny.
Se pa pou w fè sa. - You must not (shouldn't do that)
Se pou li pale ak fanm nan. - He should talk to the woman.
Se pou nou priye pou yo. - We must pray for them.

Kisa pou m fè? - What must I do?
Se pou w ale. - You must go.
Kisa pou m di l? - What must I tell her.
Se pa pou di l anyen. - You must tell her nothing.
Kisa pou m pote pou ou? - What should bring for you?
Se pou w pote yon boutèy diven pou mwen. - You must bring me a bottle of wine.

Then carry your attention to the tenses; "ta" → should, would

1.
Se pou w ta ale.
or
Se ale pou w ta ale.
You should go.
You should have gone. (depending on context)

2.
Se pou n ta di l laverite.
or
Se di pou n ta di l laverite
We should tell her the truth

3.
Se pou w ta pale avè li.
or
Se pale pou w ta pale avè li.
You should talk to him/her.

4.
Se pou w ta wè sa.
or
Se wè pou w ta wè sa.
You should have seen this.

5.
Se pou w ta la.
or
Se la pou w ta la.
You should have been there.

6.
Se pou l ta pran remèd la pou l santi l miyò.
or
Se pran pou l ta pran remèd la ou l santi l miyò.
He should take the medication in order to feel better.

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words