Thanks for the tip.
Downloaded the trial and everything worked without issue. Being able to play multiple tracks in sequence is a useful step forward. From a playback perspective it's a shame that you can't lock the device to turn the screen off and run the app at the same time (to preserve battery power). Greater playback functionality would obviously make the app a lot more useable for music listeners too.
I bought the app anyway in the hope it encourages development of a 'USB Playback Pro' version. I would be happy to pay again for that and I'm sure others would too.
Edited by jr41 - 2/6/13 at 10:39am