With the firmware update of the nano iDSD taking it to Quad-Speed DSD256 we are very pleased to introduce the following Japanese website which has some free Quad-Speed256 tracks:
http://wechdomi.org/
Here are three tracks that are in the original Quad-Speed DSD256 format.
http://wechdomi.org/M333/k2.dff
http://wechdomi.org/M333/k4.dff
http://wechdomi.org/M333/o5.dff
Just click on the specific link and download the respective Quad-Speed DSD track.
Enjoy!