Here is a link to the faq for Singer's Showcase. This may help with some of your questions:
http://www.singersshowcase.com/faq.php
We are not able to record songs on this site. This is what I do: I record on my PC using a program called Cubase. When I have the song recorded and mixed, I convert it to an mp3 file that will fit into my allotted space. For me, that's 3mb per file. (I think a 4min. song would be converted to a 96kbps file) Then, I upload it to the site.
Certainly, if you have any of your personal recordings burned to cd, you may upload them to Singers Showcase. Just be sure to convert them to mp3 first, and make sure they are the proper size.
I've never connected a karaoke machine to my computer, but I know that it's possible. I think some folks here do it that way. I'm sure someone will be along soon to help you out.
I hope you enjoy your time here. We were all new once, so feel free to browse the forums and ask any questions you like, people are very friendly and helpful here.
Best wishes,
SweetestL
Your comment about finding out that you are a KJ made me giggle.
![Wink ;)](./images/smilies/icon_wink.gif)