Nine to the Inch, converging canon in four tempi · 2026
Roll
N° 105 · 88-note · Tempo 40
Kind
Computed, then cut
On this page
Complete: 160 holes, 12 in of paper, 15 s
Whole roll
One foot, plays 15 s
Price
$24 · Ships in 1 week
Plays on
Any 88-note player piano
One 40-note line in D, played by four voices at the speeds 3 : 4 : 5 : 6. The slowest starts first and each faster voice starts later, so all four reach the last note together. No pair of hands can hold four tempi; a roll can.
The leader: tab and eyelet for the take-up spool, the printed label, the start line.The whole roll, cut into 3 lengths and laid on the bench.
Tempo 40
Over the tracker bar at Tempo 40: a hole sounds, in red, while it is open over the bar.Close up, with the bench ruler in inches and the hole pitch of 1/9 inch.