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No, don't need vref output at all. It's 1/2 VCC which I accomplish on the board with VR1 and two resistors.
Sorry about the bAmp_scale. I just went off memory since I didn't have my development laptop available at the time.
Go to the section of code starting at line 1323. You'll need to remove the semicolons on the 6 lines of code there to allow bAmp scaling. Line 1325 selects the scaling value. This is where you would enter .19.
Screenshot attached.
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