Hello Afterhours!

I'm at the moment working on a song where I'm using a vocal sound. I'm using FL Studio 10. In the vocal pattern theres a deep voice and a higher pitched voice also, that makes random noices on top of the other deep voice. I wan't the high pitched voice removed so I have only got the deep voice. Which tools should I use, or can you link to any tutorials on this mattter? I've looked a bit at Newtone and Edison, but don't quite know what to do.

Thanks for your help!