@Woland - appreciate the great guide on getting this up and running on Rpi... it's working pretty well for me, just trying to solve a dropout problem in the first few seconds of playback. I'm feeding a Holo Spring 2 via i2s from my Pi2AES. Upsampling Qobuz using sinc-Mx to max 19200 using NS9 dither. A couple of seconds into each track, the music pauses and then replays the last second or so - playback then continues to the end of the track without a problem. This happens on every track in the playlist. Anyone have any insight? or is this expected behavior? Assuming I can get this dropout problem solved, then my second question relates to the hardware fingerprint required for licensing... I asked this question to signalyst a few weeks ago, but haven't heard a response - again, appreciate any insight someone may have: ----------edit---------- For those that may have had the same fingerprint question - here is the response I rec'd from Jussi: SDcard change doesn't change the fingerprint. Most hats, such as audio ones don't change either. Changing the RPi main board does change the fingerprint.