[captione]

In addition to @captione instructions, note that earlier U1 versions would go in (deep) sleep mode after ~15-20 minutes with no input signal (no music). The only way to wake up U1 internals is to unplug/plug the USB, which could be annoying in desktop use. The more recent FW versions require setting the volume pot. to 0 to enable the automatic sleep mode, which addresses the inconvenience. That being said, it is possible that U1 (the Amanero-like interface) become unrecognized on your PC after a while, so you may have to unplug/plug U1 from time to time anyway…

This is very true on my AKM U1 that I turned into J1, which is the earliest version. You'd still have to plug and unplug it after some time. A bit of a pain for some, but it's a drawback I'm willing to have.