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Old 20th January 2022
I looked at the manual of comparable interfaces with 2 mic + 2 line inputs, and none of them seem to offer adjustable levels on the line inputs. Then how do people use these inputs? Do they use a separate mixer before the inputs to boost the signal?

The usage diagrams show connecting a keyboard directly to the line inputs. That assumes the interface and the keyboard agree on what the proper level should be. Apparently they don't. There must be a reason the Roland Studio Capture has adjustable line levels.