@calamar87 what is the output device/ Poweramp output you're using? (It should be Hi-Res output, even for standard output resolution on Pie). Please try to go to your Poweramp Settings / Audio / Outputs and hit Restore Defaults to get device optimized defaults. I test Poweramp currently on 6 Samsung Pie devices (S9+ qualcomm, S9+ exy, S8 exy, Note8 Exy, S10+ Exy, A7) and I can't reproduce issue with notifications or other sound in background + DVC.