Karaoke music - Need Help

Hi. I would request some help here

I have a Karoake that works with youtube. The only option to connect to my music system is using aux cable. But when I connect the same, it only plays only my voice and not the karaoke music.

After testing all possible options, the final workable solution is to get a 3.5 mm splitter to enhance the audio coming from TV and Karoake with a single output going to the music system.

I am not able to find the Audio enhancer. Please suggest what I can use and where I can get it from?

Thanks

Nav