I ordered and received the recently released Fiio E17 DAV/Headphone Amp and have been using it with the N900. I've ordered a USB Micro B to Mini B Cable to see if I can connect it to the N900 using USB Host mode. If I'm able to connect it, and use the E17 as the audio output, I'll be able to take full advantage of the E17's nice Wolfson WM8740 DAC. This will require the N900 to be in USB host mode, and for there to be drivers for the E17 on the N900, and for there to be a way to select the E17 as the output sound device. I can then load FLAC files on the N900 and they will stream digitally to the E17