10. When you switch to PO output and play DSD or ISO tracks on M5, why is there no output at the 12th level and below?

In order to ensure the best sound quality, the DSD track played on the M5 is hardware decoding. Due to the limitation of the decoding chip volume level, the hardware DAC output is already the minimum amplitude when the volume is 13 level, and the 13-level volume is already low enough, even in a quiet environment it can also meet the minimum listening needs, so this mutation does not affect the user experience

Therefore, there is no output when the volume is 12 or less.