It seems that each audio effect must be purchased individually and only through "Boom 2" interface - correct?
I'm not comfortable giving credit card or paypal login info through the "Boom 2" app. Is there any other way to purchase?
And, is there ability to purchase all 3 additional effects in one transaction?
Yes, audio effects pack or individual effects can be purchased either within the app or at the time of purchase. We assure you that it is safe to purchase in-apps within Boom 2 itself.