Minor tweaks needed
Its a nice app. I have Boom 3D on my MacBook and it works well. The iPhone version is no different, but one noticeable issue is that when playing songs from the control center (swiping up from the bottom of the screen), the pause/unpause button sometimes needs to be clicked twice for the song to play. The time left for each song is also inaccurate. Other than that, Boom works as it should.
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Boom: Bass Booster & Equalizer, v1.2.1