Re: Buzzing when fretting
Buzzing occurs when the string vibrates against a fret, so a fretless instrument like violin is generally buzz-free.
You do have to hold down mandolin strings fairly firmly; remember you're pressing two strings instead of one. The "pinky" (if that's what you mean by "fourth finger") has less strength than other fingers, and if you're stretching it to hit, say, sixth fret on the fourth course of strings, not too unusual to not fret the string(s) cleanly.
The height of the strings above the fretboard -- which we call "action" -- is adjustable on most mandolins, by lowering the bridge saddle, do if you're getting frequent buzzing when you fret, you can lower the action. Of course, if you lower it too far, then the strings may hit the frets due to insufficient clearance, and then you get buzzing again. Like most issues of this type, it's a matter of compromise.
You could take your mandolin to a qualified repair tech and have the action analyzed, and perhaps adjusted. Violin and mandolin have the same tuning, but different scales, string composition, and playing techniques -- as you already realize. I'd keep trying and see if the issue lessens with familiarity and additional playing.
Allen Hopkins
Gibsn: '54 F5 3pt F2 A-N Custm K1 m'cello
Natl Triolian Dobro mando
Victoria b-back Merrill alumnm b-back
H-O mandolinetto
Stradolin Vega banjolin
Sobell'dola Washburn b-back'dola
Eastmn: 615'dola 805 m'cello
Flatiron 3K OM
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