@catbonepowder that's the correct page. the LED should blink regularly during transfer though. if it flickers like in the video, please try again with different volume or send from a different device.
@ghidraninja The whole process was developed together with the manufacturer and they do the glueing. However, if you don't mind removing excess glue and flash on the edges you could use standard manufacturing.
@ghidraninja sure: you make one .5mm PCB with parts on top and pins on bottom. the other PCB is 1.5mm with a 1mm depth routed cavity for the parts (which must not be higher than 1mm). then you glue them together.
@dryaaaad nanoloop supplies audio at standard 44.1 KHz / 16bit, there is no separate setting for bt. any loss / compression would be added by the system. maybe when the bt connection is poor the bitrate is lowered automatically.