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reading from the screenshot you already have system:capture_1,2 connected to Qtractor:Master/In_1,2. that's perfect. however what you mean is that you don't get any signal from those lines, right?

a. try using alsamixer to tweak the capture controls (mic) up; maybe better to run from a console/terminal as alsamixer -cN, with N=0, 1, 2, ... being the sound-card slot number in effect on your system (probably N=0 for the internal on-board device and N=1 for the Scarlet via USB).

b. besides that, check on the actual hardware box, front-panel and/or rear-panel, whether there are any hints or controls to get the actual Mic line signal in.

hth.
cheers