That would be an interesting point compared to the previous UB420 which converted DSD signals to PCM.
If an early buyer of the UB450 and owner of an AV receiver decoding native DSD could try it out and confirm it?
A close relative who already owns the UB420 just bought the UB450.
Therefore I can confirm that the UB450 is able to decode DSD natively. With the proper AV receiver you will get native DSD as input, without any PCM conversion.
However, the gapless playback option from UB420, UB820 and UB9000...
If you press the blue button while displaying the playback screen of an album or similar group of songs containing a sound source recorded at a live performance or concert (a music file containing songs that are recorded continuously)*, you can perform seamless playback without gaps between songs from the beginning of the selected folder or track.
* AIFF, DSD (DFF), FLAC, WAV