Maybe I've missed how you explained it, but if you have one file that's the entire song, and then depart to repeat or skip a section, how do you get back to the point at which you stepped away from the linear song?

Sounds to me like, once you stopped playing the linear song, you were back to needing to hand cue everything from that point onwards.

I think what it needs is a cue sheet. After A, then B. After B, then C, etc..

That way, if you repeat B, unless you give it a different next section, it AUTOMATICALLY goes to C, etc, etc..

If it's just markers in one file (the way my iPad app does it) then it works great. But if you actually need to prepare up different files for each section, a cue list should be essential...

And yes, unless you can label them Verse, Chorus, Bridge, Solo, Ending etc, it's going to be next to impossible to remember what does what.

I'm an expert on features that WOULD have been great if they'd only changed one tiny thing or two... it's Roland's basic premise! You only had to make TWO simple database links on a BK9 to have a chart (a jpg of either the lyrics or the sheet music) and a chord sequence loaded with every Performance..! The core elements to do it are all present. They just never had the Performance automatically load them. 🙄

Little things make a huge difference. There have been many times that led me to believe the people coding the arrangers' OS's DON'T PLAY ARRANGERS FOR A LIVING..! Utterly obvious things get missed....

I think Ketron have missed a couple of obvious things here, but they should be able to be corrected quite simply...
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An arranger is just a tool. What matters is what you build with it..!