I find this Q&A helpful.
https://hifigo.com/products/soncoz-la-qxd1-dac-fully-balanced-digital-audio-converters-with-xlr#:~:text=Press%20and%20hold%20for%202%20seconds%2C%20the%20mute,to%20%E3%80%8ALA-QXD1%20DAC%20filter%20mode%20setting%20truth%20table%E3%80%8B
And this article helps me...