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kotlinlang

Hello all. I am developing a karaoke application in which user can sing with the background music with both video and audio. It is just like one popular application on the Play store <https://play.google.com/store/apps/details?id=com.starmakerinteractive.starmaker|StarMaker>. But the thing is I am unable to find any library which can do recording and playback with live feedback of own voice in-ear, with music and voice synchronization. StarMaker is actually doing that all of that in realtime. So can anyone tell me about any library or any source from where I can develop a karaoke application?