Re: Vangoa electro acoustic Mandolin
Well -- I'm not sure what you mean by a "chart." What "open tuning" are you planning to use? The chord equivalents would be the same as your guitar "chart": if you tune to an open G chord, first fret would be G#/Ab, second fret A, third fret A#/Bb, and so forth.
You'd need to do some thinking about how you string the mandolin. Guitars, with their 4th-and-a-3rd tuning intervals, are more easily retuned into open tunings. Mandolins, with 5ths tuning, have wider separations between string pitches; if you slack the 3rd course of strings, for example, down from a 5th to a 3rd to make an open chord with the 4th or "bass" course of strings, you'll find that the 3rd strings are loose and sloppy. And it just gets worse for the 1st and 2nd courses; wouldn't work with standard mandolin strings, IMHO.
Plus, you're turning the mandolin into a purely chordal instrument, and losing what makes it a brilliant melody instrument. You may be able to jigger the stringing so that you get something of a mandolin sound from the chords, but you'll basically just have a small, thin-sounding guitar.
If the "reasons you won't go into know" involve some physical limitation that makes it necessary to avoid fingering chords, then using open tuning and barre chords may well work for you to at least get a sort of "mandolin sound." I knew a woman musician who was born without a left hand, and had an attachment made with a steel bar on the end, enabling her to play open-tuned guitar in a "Dobro-like" style. Other than that, I'm a bit "stuck" to offer any other advice. Open-tuned, barre-chorded mandolin is a new one on me.
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