these are intionations.
Apparently, IK-1 should be produced in sentence like this:
Студенты приехали из Америки.
(слог "ме" это интонационный центр предложения)

And IK-2
Из какой страны вы приехали?
Сейчас будет лекция.
The theory says that it should be used in questions with вопросительтное (couldn't figure out how to say it in Eng ) word, and in statements when we want to put some emphasise.

And if I recall right IK-3 was the intionation used for questions without вопросительтное word. I can't find the notes I made on this one during the lectures, must've lost it :/

That's all I understand from it; I get confused about IK-2 & IK-3 mostly - it's like I can repeat it correctly after someone, but I can't seem to produce it by myself, without any clues. And I thought maybe if I had it recorded it would be easier for me to try to work on the intonations, since I would at least have some example sentences.
That's why, if it's not too much to ask for, if someone decided to record it, I would more than appreciate it if you could put it on a server that allows downloading, like zshare.net