A count of measures plus a beat location, i.e.
, [0-9]+m *\+ *[0-9]+(\.?[0-9]*)?. The
measure count is the number of bar lines crossed by the event, while the beat location
timestamp expressed as a beat with an optional fractional part. For example, "1m+3.5"
indicates a point in the next measure on the second half of beat 3. The measure number
in the range of 0 to the number of remaining measures, while the beat number must
be in the
range from 0 to the numerator of the time signature plus 1. For example, in 6/8 the
number must be within the range from 0 (the left bar line) to 7 (the right bar line).
with a measure number of "0", such as "0m+2", indicates a point within the current