Great answers.
I've seen people freeze when doing sound checks, or fall apart, ..go all "fingers & thumbs".
My own approach is firstly I'll ask the "desk prefect" what they would like & if they're not bothered, I'll tend to do a few open string peddles and then some lines of songs from the set, on the fretted & then the fretless. They're both P basses with same bodies, necks, pups, wiring & strings. Tone rolled off 50%. The LMII is flat & pre eq.
I tend to think that as long as I'm happy with on stage volume and everyone else is, I'm not in control of FOH sound so I'll not worry about that. To be fair we have our own sound desk attendant, and they know what sound the BL wants, plus my set up is very basic.