Even in this older version, the audio engine is phenomenal. It supports:
Beyond standard light/dark modes, it offers fluid animations and a wide library of 3rd-party skins. Quick Tips for New Users Poweramp Music Player – Android Hi-Res Audio Player Poweramp 6.3 Apk
However, v6.3 remains popular among users who prefer the classic interface and have older Android devices. Even in this older version, the audio engine is phenomenal