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However I will consider transferring it all onto the external SSD.

The best way to do this would be to create an "Applications" folder on your external drive if one doesn't exist, and copy/merge the "Band-in-a-Box" folder from your internal drive to the Applications folder on the external. Then, move your RealTracks and Drums folders (already on the external) into that Band-in-a-Box folder. Then, in the Band-in-a-Box program, uncheck the custom location settings.

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kept getting Not Enough Disk Space Error message and this seemed strange because I still had around 150GB of free space on the MAC drive.

Thanks, I fix the spurious error message - it is most likely not taking into account that you are removing installer files.

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One thing that puzzles me is why when selection a Style using the Style Picker, the previously selected Style continues to play (preview) regardless which other Style I pick unless I double click the new style. Selecting a Style and clicking the play button will not play the selected style unless double clicking the new style or first clicking Generate.
Is this normal?

The Play button in the StylePicker plays the current song - with the currently loaded style - from the current position. Double-clicking on a style in the StylePicker window does not load a style, that demos the style. There are two ways to demo a style, and you can select the default behaviour by clicking on the [+] button. It will either play a pre-made .m4a audio demo, or it will play your current chordsheet with that style. You can click on the [+] button or right-click/control-click to choose which demo you want. To load a style, right-click on Load Style, or click Apply.

Andrew
PG Music Inc.