The track at which the keyboard is divided, so that notes from here upwards follow the treble expression and the ones below it the bass. Which side an expression perforation itself belongs to is not decided here but read off the tracker bar.
Constants of the nuancing mechanism, one set for each half of the keyboard.
How the pedals go out: as a continuous controller carrying the travel of the bellows, or thresholded to the two values a switching renderer understands.
Constants of the two pedal actions, one of pedalPresets or a set of one's own.
Punch diameter for an edition whose copies record none.
The take-up spool, which sets the time axis: it is held at a constant
rate of revolution, so the paper runs faster as the spool fills.
Where a speed is stated for the version's copies, or a re-cut is timed
by the roll it was made from, the spool is started at that speed and
only its geometry is taken from here; see spoolFor.
Diameter of the tracker-bar bore.
The options every Welte system takes.