(I apologize in advance for my English)
In my opinion, a couple of things would be great for the future of this awesome app:
1.- The option to don't use the resampler, so 192kHz files will set the output at 192kHz and 44.1Khz will set the out to 44.1Khz automatically.
2.- Don't change the interface. It is simple, intuitive and NOT colorful. One of the best UIs I've ever seen.
3.- Show the playlist/album duration. Between the number of songs and filter, maybe.
Also, thank you. The Meizu pro 5 DAC support is one of the best things that ever happened to me.