I used the Ultra streamer before and it had the ability to play files from a connected USB drive gapless. Now I have the Amp Pro and it has some problems with the same drive. Through an app such as BubbleUPNP gapless does not work. In the Wiim's own app strange things happen, for example the next track follows gapless, but a second later it jumps to the next track in sequence (and here it takes a break). Perhaps some further firmware could improve this?