Procedure
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In the Inspector for a MIDI or instrument track, open the Expression Map section.
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Click Select Expression Map for the track and from the pop-up menu, select Expression Map Setup.
The Expression Map Setup opens.
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In the Expression Maps section on the left, click Load.
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In the file dialog, locate and select the expression map that you want to load, and click Open.
The expression map is now available in the Expression Maps section.
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Repeat the steps for all the maps that you want to make available, and close the dialog.
Result
All loaded maps are available on the Expression Map pop-up menu in the Inspector.