Using the ‘View script variables’ plugin to check the variables of a recording, I don’t think the Classical Extras plugin provides such a ‘location’ tag:
(I could be wrong though, CE is a complicated piece of software)
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Your plugin Artist Variables Plugin makes many more variables available.
Is it feasible that you could add variables such as this ‘recorded at’, and also ‘instruments’, ‘instruments credited’ ‘instruments all’ (as I requested in the plugin thread) to it so that they become available for scripting?