These class-based attributes use data.BEATRPT.REND
att.beatRpt.vis/@slashIndicates the number of slashes required to render the appropriate beat repeat symbol.
When a single beat consisting of a single note or chord is repeated, the repetition
is a single thick, slanting slash; therefore, the value 1 should be used. When the beat
is divided into even notes, the following values should be used: 4ths or 8ths=1, 16ths=2,
32nds=3, 64ths=4, 128ths=5. When the beat is comprised of mixed duration values, the
default rendition is 2 slashes and 2 dots.