OptionaldurationsLength of each counterpoint note, measured in cantus-firmus notes: 1 is a whole note filling a measure, 0.5 a half, 0.25 a quarter.
The first four species have a fixed ratio, so the durations are implied by the note count and this is only needed to describe something unusual. The fifth species mixes note values by definition and cannot be read without it.
OptionalcounterpointWhich side of the cantus firmus the counterpoint is written on. Defaults to whichever side it actually lies on, by mean pitch.
Options controlling checkSpecies.