No, OneKaraoke1 doesn't have support for pitch control or MP4s. In fact, the software is considered to be discontinued. I've searched all over the Internet with hope to find it but failed.
Therefore, there is another application that supports all the features you mentioned in your inquiry. It's called Power Karaoke and it's more than just a simple karaoke player. Access the following page to learn more about it and its features.
