Yes, I disabled the volume control on my phone and Neutron media player (it is the same with any other player also).
Indeed my player goes into direct bit-perfect mode on DSD, if I activate "Native DSD" option (no processing, EQ or even levels).
USB is consistently about 6dB louder than BT.
So far the only remedy for me is to disable "Native DSD" to get controls back and limit USB level to match BT (can be done with my player).
This also eliminate the occasional overload distortions too.
Indeed my player goes into direct bit-perfect mode on DSD, if I activate "Native DSD" option (no processing, EQ or even levels).
USB is consistently about 6dB louder than BT.
So far the only remedy for me is to disable "Native DSD" to get controls back and limit USB level to match BT (can be done with my player).
This also eliminate the occasional overload distortions too.