annoying playback problem with the music app

I have a similar problem.However, the music does seem louder if I turn off audio ducking. Still not as loud as it should be however.

Hi! I've sometimes had the problem you describe here, where some songs played in the Music app on my iPhone are at a lower volume than they should be: I don't know why this happens, but it seems to me that audio ducking randomly stays ducked sometimes. One workaround I've found is to toggle VoiceOver off then back on, then the music volume usually sorts itself out, with audio ducking back to normal if I have that on; I hope this helps!

All,

Have you double checked your settings for the music app? Go to setting music. In there there are a few settings like Equaliser, volume etc. Depending if they are turned on or off you can be defaulted so that the music is lower than you'd like.

HTH

Hello,
When I use the music app, the audio ducking does not work properly. This, being said, I play a song and when I touch the screen, the volume of music is not decreased. If I double tap the screen with two fingers to pause the music the bug is fixed. Turning voiceover off also helps. If you have the audio ducking off, then I don't know what could be the issue. since iOS 9.2, I have had problems with voiceover and music app. You could ask a sighted person to play a song on your iPhone with voiceover off, and see if anything differs.
Cheers.