@Faddex i use free app called "musicolet" , it's a music player , not standalone app that can be used alongside Poweramp ..
I only use that app in case i need to train my voice in the morning .. yes , with phone speaker ,, it sounds terrible when using earphone set ..
Maybe , max doesn't add this feature because of the output results .. although Poweramp are capable ..
But , it's nice to have ..