I've been using Poweramp Pro for over 10 years. It is by far the best music player in the app store. I only have one issue! A few months back I purchased a USB DAC to listen to lossless flac music. Unfortunately the USB DAC isn't usable with Poweramp. The reason being is that the sound is really low, even at max volume. As a result, I had to resort to using other music player apps like "USB Audio Player Pro", which does use their own exclusive driver. As a paying user, I'm requesting for the developer to add exclusive driver support. Thank you.