13. Why the volume on the X5II's LO can not be adjusted when playing the DSD files?

A: As you know,  the function "Line Output level options (fixed or variable level)" is already added to the new firmware FW2.0(click here) for the X5 2nd gen.  But some users may find that the volume on X5II's Lineout can not be adjusted when playing the DSD files. 
Kindly be noted that, the volume can't be adjusted by the X5II's DAC PCM1792 itself, so that is why we add the analog volume controller PGA2311A. But because the Lineout will bypass the PGA2311, when playing the DSD files, the volume on X5II's Lineout can not be adjusted, but the headphone output can.