Anyway it would be great to have a ‘mode’ like other ‘double pushes’(source select or gain select) to see the format light all the time. Cuz if you have connected to some streaming devices(like rp4) it is hard to say what is playing without accessing to the player UI.
We did think about this particular possibility. However it was decided that the various colors should be used to indicate the current mode, rather than the file format to avoid confusion.
Since a majority of people don’t care too much about the file format; just how awesome the music sounds. But I do agree with you that for testers and evaluators having to see the file format is important.
For example I needed to check if the driver is allowing bit-perfect playback, and not PCM conversion. So often times if I missed the format-color-flash, I would have to stop and restart the track playback again to check the color flash once more.