Dear Gina, in our organ we used the Ambrette (Hibiscus Abelmoschus) essential oil. There is also an absolute but I do not use it because maximum power is in the essential oil. The CO2 extract is even less powerful than the absolute.
Your perfumes will be only as good as your ingredients are. The best for ambrette is the essential oil.
I do not like co2 extracts, they do not have life, brightness and longevity,