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If I understand correctly, when I meet a N / A it means that RealTrack or RealDrum are not harmonized to work together ...

Not quite correct. It means that certain RealTracks required to make up the style have not been found. They are Not / Available.

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also another question is at the level of REbuild ,,, do I have to rebuild before every search in realTracks ..? what is the function exactly for the action of Rebuild ,,,
thank you very much
Dominic

No, you should only need to rebuild once. This is generally after new RealTracks or RealStyles have been installed, or the program has been updated. The function of rebuild is so that the program can 'learn' what is available for it to use.

If a Style shows that RealTracks are N/A this means that the RealTracks (the musicians e.g. bass, guitar etc) required for the Style (the required band members to make up the band) are not available.

Think of it like this:
RealTracks = each of the Musicians that are going to play in your band,
RealStyle = a group of all the required musicians needed to make up the band.

Hope this helps.

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