Hi Dan, thanks for your input.
I also was wondering that the slow strings might only play in a part B section, but that's not so. It does play an embellished arrangement in Part B but also plays in part A.
What I have found is that it works if I start a new song. But doesn't work once a song has been 'used' (I don't know what constitutes 'used', sorry crazy)
Here I started a new song with an existing RealTracks Style, and put the Slow Strings from the same Custom MIDI Style onto both the Melody and Soloist Tracks and it works perfectly.
The program should at least offer a message to the user that it cannot deliver one of its own internal functions. The program must know that no MIDI data gets generated. I'll keep looking, and I'm sure mine is not an isolated case. I expect that I'll need to escalate this to Support.

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