I actually installed it a few days ago but finally have time to use it. It takes a while to figure out all the touch areas of the Now Playing screen. So far it seems:
Top left: menu
Top right: files
Middle of screen: back, play/pause, forward (according to position - just like the keys)
short press: short cuts menu
long press: speed and pitch (but who uses this...)
short press: current playlist
long press: file information
Not complicated to remember the important ones once you get used to it.
The Rockboxed DX50 really sounds great through the line out. No CODEC issues here. And it really is nice to have Rockbox crossfeed and active playlist again.
This looks to bring my DX50 + Pico Power combo out of retirement. Back to a stack.... :-)
Yup, rockbox really elevated the performance of LO. Unless iBasso adds new function (e.g. usb dac) I don't think you ever needed another FW update. At default SQ settings rockbox truly reveal how transparent/neutral the DAC can be and I have been enjoying it more than I used to with any of the stock FW from iBasso.