If using Jet Audio you have to go to sound effects-show sound effects settings - and at the bottom is OUTPUT.
some files for me show up as 192kHz, stereo, 32bit. Others 48kHz,stereo 32 bit and others as 41.1kHz.
Make sure however you see what the file info says the encoding is. That's on the playlist menu - file info - for any selected file.
Example - Life_is_Good.flac (came with the phone) show up with.
Audio Info - FLAC 5.4Mbps, 192kHz, Stereo 24 bit
Output 192kHz, Stereo, 32 bit.
I should probably take a screen shot.