Poweramp is a long-standing, feature-rich Android music player (package com.maxmpz.audioplayer). “alpha-build-709” is an older alpha/test release from 2018 with improvements to high‑res outputs, dithering and notifications backported from beta builds.
Build 709 was primarily focused on audio fidelity and hardware compatibility. It included: Poweramp Alpha-build-709 Mod Apk