> "Business logic" normally dictates the relative ordering and contextual legality of certain operations and data values.

Wikipedia gives the following definition for "business logic"

> In computer software, business logic or domain logic is the part of the program that encodes the real-world business rules that determine how data can be created, stored, and changed. It is contrasted with the remainder of the software that might be concerned with lower-level details of managing a database or displaying the user interface, system infrastructure, or generally connecting various parts of the program.

I (and i believe op) lean on the "domain logic" end when talking about business logic.

So the fader toggles bits in the raw data, but in a way that input and output is sound data that can flow through the application. Your DAW needs both the bit fiddling - and the "flow input through the fader and out to file" parts.

> Musicians typically have only a vague idea, if they have an idea at all, of what they are trying to accomplish.

I'm talking much more abstract here - "improve recording" is a goal - there's a current domain state, and the goal is to modify it in some way. I'm talking about user intent in interacting with the domain.