The volume of Preciso is lower on USB than on coaxial. What should I do?

If the volume of Preciso is much lower on the USB input than on the coaxial input, check the startup volume setting in Volumio.

1. Go to Settings → Playback Options → Volume Options.

2. Set Default Startup Volume to 100 and save.

3. Then adjust the listening volume with the right knob of Preciso.