Delete button
 

The delete button used to work when a karaoke track was playing you couldnt delete the playing song but you could delete songs in the rotation ..now its greyed out in 4.10 until the current track is stopped ..

Is there a way to delete songs in the rotation while one is playing?

It apparently caused some machines to crash, you can delete while the B/A is playing. Some have suggested using the Skip button and dragging songs above the playing song.
I believe they will be bringing it back as there have been other requests for it.

Roy.