@andrewilley I only tried the Poweramp equalizer app the first time it was released, back then, I asked for the difference between the one on main music player and the stand alone EQ, I was told that the EQ app is for those that want to use it for other media player, and moreover, most of the features will be ported to main player, so I unstalled it even before my trial period was over. I will reinstall the EQ app and turn off that settings you mentioned to see if it will help, although I did not use the EQ app on this phone (Samsung galaxy m51) but I did transfer with s switch from the galaxy m30, but at that time, EQ app has been uninstalled. Maybe the settings was copied over?
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I downloaded the EQ app and tested the Vol- pause and vol+ resume, and it worked, but that was because, EQ app volume (default) is set @ 50, I don't know where to increase to 100, and that is what I use in the main player for smooth Vol increase.
If I should use Vol step 50 in Poweramp, the volume pause and resume track feature will function, but I don't like the drastic change in volume level, what I do now is flip the phone over for pause, and again for resume,(Tasker).
I should say that with the EQ app, Poweramp sounded different, although both apps eq were on.
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Wow, I just noticed something, I disabled pause/resume on Vol, on both apps, and re-enabled it on Poweramp and it worked Flawlessly, what I want to do now is uninstall the EQ and see what happens.
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I have uninstalled the EQ and the feature is working, the next step is to extend the feature to function with display off and whenever Poweramp is playing audio, or make it as a feature that can be turn off for those that use multiple media player, for me I don't, thanks to Samsung for making it possible to uninstall most pre-installed apps like their music player.