Mini (3.5mm or 1/8") to RCA and Mini to Phone (1/4")

Just bought a CR4 Korg 4-track and was wondering if some of the cables I was planning on buying will work.

If I buy a Mini (3.5mm or 1/8") to RCA cable (CR4 has RCA line out) will I be able to plug that Mini right into my computers microphone jack and be able to recieve?

and...

If I buy a Mini to Phone (1/4") cable will I be able to connect the Mini to my headphone jack on my computer and be able to plug the Phone(1/4") into the CR4's phone jack and be able to send?