EVP

I really believe there is a spirit here. I hear strange noises at night and one night I heard a muffled voice but could not make out what she was saying. One time on the monitor I heard a male voice saying to Isabella "what is wrong with you?" when she was crying. Needless to say it freaks me out. However, the energy here is so great that I am not too worried about it. Where we lived before the condo was definitely haunted and had a bad energy.
I was thinking about EVP and if it would work. Do you have to buy special equipment for that or could I use any ordinary tape recorder?