Sorry for steering things slightly back to audio - I don't think I've even used the camera on my V30 yet
The reason for this post is that there seems to be no single music app for the V30 that's optimal (or even works) in all situations. Here's my attempt at a (hopefully) not-too-techy summary of where we're at. If I'm wrong, or have missed something crucial (or if anybody knows a fix for Neutron DSD playback), please let me know.
Ok, I give up with html tables! Here's the basic text stuff:
LG Music app
Pros:
Plays all hi-res PCM formats without down-sampling and plays DSD via DoP
Cons:
Up-samples all 44/16 FLAC to 48/16 and outputs everything via USB as 48/16
Neutron
Pros:
Plays all PCM files at original sample rate through the internal DAC (or through USB-out if the "Direct USB Driver" option under the Audio Hardware menu is set to on)
Cons:
DoP doesn't work, so Neutron converts all DSD to user-given-sample-rate PCM (via both internal DAC and USB out)
USB Audio Player Pro
Pros:
Outputs everything correctly via USB
Cons:
Can't (yet) play anything other than 48 kHz Android-resampled audio through the internal DAC
Why does all this matter? The V30 is an awesome-sounding phone, but it sounds even better if you play files back in their native formats. On certain tracks, the audio quality improvement in native 44/16 playback on Neutron versus up-sampled 48 kHz/16 via the LG Music app is easily noticeable.