With a few exceptions, where the devices themselves or the connected DAC do not support it, I do not understand where the problem lies here. Of course, it may be that Poweramp outputs the sound in High Res on the software level, but in the end no High Res comes out. But Poweramp can't do anything about that. Apart from the fact (this is just my opinion, you can have a different view on things) that High Res doesn't really make much sense except for the higher sampling rate. More precision between 11025Hz and 22050Hz because less quantisation errors can occur. But more than 96dB dynamic range doesn't make sense to me, because even these 16 bits are never fully exploited by producers nowadays.