But I did not found “repeatSingle” button from the web interface.
Have you removed it? Or I have to do something special to show it?
I am use volumio to play some violin music to my child, and sometime we do need repeat special single song for many many times. So this feature is very useful for me.
Not answering your question, but a solution of a sort for now. Add the track to the queue. You can then repeatedly restart the track from the beginning by clicking on the track name in the ‘queue’ UI.
Perhaps you need to better explain your exact expectations? Try adding your child’s song to a playlist and select repeat. This will endlessly repeat it.