please note that a FIX for this exists
Poweramp does record ONLY IF the Poweramp Trial Unlocker is UNINSTALLED (Poweramp Equalizer APP seems fine however)
once Poweramp Trial Unlocker is uninstalled Poweramp can be recorded again once its AudioStream is recreated
either
1. CLOSE (X) the stream from notifications then remove Poweramp from recents, (BOTH need to be removed, order does not matter)
or
2. force stop
and then re-open Poweramp, this will re-create the stream
do note that BOTH Poweramp and the Stream must be closed, closing the Stream while Poweramp is STILL OPEN (not removed from recents) will not work
to clarify: the Poweramp Trial Unlocker MUST NOT be installed if you wish to record audio from Poweramp