Adder 1 adds 1 of the multiplicative base of that value, so points add 1, gems add 0.1 and plasma adds 0.01. Adder 2 is the same but 2 instead, so points add 2, gems add 0.2, and plasma adds 0.02. Multiplier doubles the current amount of currency, but does not change how much the adders add as it is a temp value and not a global value, so choose wisely when to use it. Transfers: 300 points can turn into 1 gem or 1 gem can become 100 points, 300 gems go into 1 plasma or 1 plasma becomes 100 gems, this it to keep balance, so that you can't spam both ways.
(mostly mobile supported but mobile players won't be able to transfer currencies, making progression take a little longer)