[JBlyth]

2) If the scrolling reaches the end of the song, then it is stopped. Pressing a link point after the scrolling has stopped is not going to start it up again. That would require a completely new kind of feature where you could associate additional actions with a link point such as "start scrolling".
That would be perfect for me - but maybe hard to program for you ;-)

5) You phrased it perfectly fine. I was just trying to explain that playing a file, in this case, means sending commands from that file to an external device (which is potentially going to be a subset of the data found in the file as not all MIDI data in a MIDi file is supported by the messaging midi specification). I also wanted to explain that the file itself couldn't be sent in its entirety to a connected device unless that device has a custom interface for that. Much like #1, I have to implement my own sequencer so that each MIDI command in the file
is sent at the appropriate time to the connected device. It will be interesting to see how the Windows 10 version handles the very tight timing requirements for this.
What I was hoping for is for MobileSheets Pro in both Android and Win 10 to be able to "play" a midi file on my keyboard just as Notation Composer does, and many other Windows midi programs (USB midi out). I know I can copy midi files for playing directly on my Tyros 4 to play along with, but I was trying to have everything including midi accompanying files in MobileSheets....

Many thanks for your explanations. I appreciate it very much.

Cheers
John