F5 is generally a shorthand for a power chord (1st and 5th), but technically isn't a chord at all (only two notes) but it's still supported (unembellished) by BIAB. I think what you have would probably be better notated as Fmaj7(no3), but alas BIAB doesn't support it. I might would try just using an F5 chord, and have either the soloist or melody instrument play the missing E.


John

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