I have High Rez selected for headphone and USB output.
Audio info shows the following:
Track - FLAC 16/44.1 908kbps 2 channels
Decoder - Poweramp Builtin FFmpeg decoder
Resampler - SW Resampler cutoff 97% 44.1kHz - 192kHz
DSP - Float64/32 bit 192kHz (further info on equalizer, volume control, etc.)
Output - Hi-Res Output, Mixed High Res 24 bit 192kHz. Flags 0x1200 SEEK_FAST_VOLUME, CUSTOM_MASTER_VOLUME Latency 401ms
Output Device - Wired Headset/AUX