From an academic viewpoint I completely understand the temperature ramps, etc., during distillation and creation of new species or combustion, however one choses to think of this reaction. Also, I believe, again academically, that the presoak while a critical step can be detrimental via growth of bacterial colonies and fungal spores, etc., which typically produce characteristic aromas. So if I may summarize for my nonstop mind, certain "regional notes" might be due to actual aroma profile of the tree species, environment, etc., yet others might be a result of regional distillation styles.
I've studied and mutated bacteria and viruses, completely understand the common DNA or RNA sequences, and appreciate the same in plants. The resin is the result of a secondary metabolic response, is this correct? And those metabolites would be common to a species within a region pending the infecting fungus, Yes? No?
So - I can think of it as a species/variety or cultivar in a region will have specific "DNA" response attributes to infection which produce the aroma profile of the resin. Therefore, while the profile of that resin is inherent the process of distillation may render an oil with the aroma profile intact, somewhat intact, changed into combustion products or other derivatives. Nonetheless experience will allow one to discern the region or location of wood growth.
Try to help me out and let me know if this is approximately true. Also add details as you see fit, I do not wish to be coddled. I am seeking truth.
Thanks