Hey,
A little off topic, but for those of you who hi-res stopped working on the Poweramp 704 after upgrading to Android 7+, try Neutron while waiting for the Poweramp update.
Settings -> Audio Hardware -> Generic Driver -> Click the little triangle page turn -> Hi-Res Codec (Direct PCM). It's working for me. Not sure how it sounds compared to Poweramp Hi-Res, but it's something while you wait.