rjh-stereo-tool.ny-Karaoke newbie question

Hello:
I am trying to take voice out of a MP3 song and I am unable to using rjh-stereo-tool.ny. After using the analysis option, I find the song is a “dual mono” and any invert operation basically resulting in NO sound as the two mono streams are cancelling each other 100%.

I tried for a karaoke version of the song, and its not available.
Given my situation how can I create a Karaoke using audacity?

Maybe you can find a MIDI version of the song. (MIDI simulates/synthesizes instruments and there are no vocals.) Then if you want a regular audio file, you’d need to either record the MIDI as it plays (usually in Windows Media Player), or get an application that can render MIDI to WAV. (Audacity is not a MIDI application, but if your soundcard/driver/operating system allow you to record what’s playing from your speakers, you can record it with Audacity.)

Given my situation how can I create a Karaoke using audacity?

“You can’t un-bake a cake or un-fry and egg and you can’t un-mix a song.