I think I may see your problem.
Remember in my last post how I said things have to be named the same and such, well, this only works for CDG and MP3 files.
Like said above, there may be other ways to convert other file types, but the instructions I gave you are only for CDG and MP3 to combine them into .bin files.
You can not combine a .midi with a .cdg, or a .kar with a .midi, or a .kar with a .cdg, or whatever combination.
MP3+G Toolz ONLY will combine .mp3 and .cdg. (Sorry, know I am repeatin myself).
Now, remember, the .bin files that are created with MP3+G Toolz are the only ones that you can use to create a CDG to play on your karaoke machine.
When you open up CDRwin, click on LOAD TRACKS. That will take you to the load tracks window. BE SURE THAT THE CDG OPTION AT THE TOP OF THE SCREEN IS CLICKED!!!! Please see the picture that I have attached. That should help. This is a very important step.
Also, be sure that the .bin files that you are loading here are the ones you are using. If you don't use the .bin, they won't work.
Once that is done, press okay. Then, it should compile a cuesheet automatically for you. Then, all you have to do is record, and you are good to go.
Hope that clears some stuff up