Carl Frei 20er

Total of 27 possible channels, labeled 0..26, in order of ascending pitch. Channel 13 lies on the center line of the paper. Channels 1..20 comprise the standard "Carl Frei" or "Raffin" 20-note scale employed by most 20-key organ builders. The use of the remaining channels is not standardized. paper width: 110 mm (4.33 inch) hole diameter: 3 mm (0.118 inch) channel spacing: 3.8 mm (0.15 inch) number of channels: 20 typical, 27 possible paper speed, typ.: 6 to 7 cm per second /1/ channel number /2/ note played by Jaeger & Brommer 20er Drehorgel, German music notation /3/ MIDI note number /4/ remarks /1/ /2/ /3/ /4/ 1 F 53F 2 B 58A# (B-flat) 3 c 60C "Middle C" 4 d 62D 5 ds 63D# (E-flat) 6 e 64E 7 f 65F 8 g 67G 9 a 69A 10 b 70A# (B-flat) 11 c' 72C 12 d' 74D 13 ds' 75D# 14 e' 76E 15 f' 77F 16 g' 79G 17 a' 81A 18 b' 82A# (B-flat) 19 c'' 84C 20 d'' 86D The image shows a portion of a 20er music roll, maker unknown, punched ca. 1998 for Jaeger & Brommer. The handwriting is by Wolfgang Brommer; he rejected this roll because of its poor quality.