Chained punches whose gap is shorter than this are one perforation. A held T-98 command is punched as a chain of round holes on a 2.66 mm grid with paper bridges of about a millimetre, not as one slot, so a raw scan and an edition whose collation has already made one symbol of the chain see the same port only if the chain is merged.
Which instrument the nuancing constants are, so that a curve can say so.
What a long perforation on the bass sforzando-piano line does. It is the
same valve and the same hole as the dynamic (Skala-Rolle §10), so it
always acts as a sforzando-piano; stop additionally ends the performance
there, which is what the instrument does — during rewind the suction to
the primary pneumatics is cut and the Hauptventil closes, so no note
sounds and the expression apparatus is out of action (Betriebsanleitung
p. 17). ignore is for an edition that is a fragment, or that carries a
rewind in the middle for some reason of its own.
The options every Welte system takes (see
WelteOptions), with what the T-98 adds. No source states a T-98 spool geometry, so the default keeps the red circumference and layer and sets the revolution to make the initial paper speed 220 cm/min; it is better varied than trusted, since it scales every conductance by k and every time constant by 1/k and touches nothing dimensionless. No source gives the T-98's tracker bore either, and the red figure is carried over. Welte puts the division between f♯ and g (Betriebsanleitung p. 7), which on this bar is track 52; PlaySK's green configuration independently gives the last bass note as MIDI 66. A green roll re-cut from a Mignon master uses only the middle 80 of the 88 note positions, so the division falls inside the used compass either way.