Bandonion
System: Péguri
unisonoric, multi-part logical
(Collection Oriwohl, Nr. A-97)
Manufacture: Co. Fratelli Crosio (Italien) around 1960
Around 1925, Charles Péguri also tried to transfer the C fingering to the bandonion. However, he did not go to the trouble of redesigning the entire keyboard mechanism, as was done with Meisel and Praktikal, but only replaced the reedplates on the 142-tone bandonion.
With relatively little effort a bisonoric instrument was transformed into an unisonoric. Thanks to the unchanged case construction, the sound is very close to that of the bisonoric bandonion.
Right side:
2-choirs (8'+4'), range: a - b3
On the Péguri bandonion, the C fingering in the form of the alternating tone manual used is only partially (62%) feasible.
Due to the right-angle hand position tied by the hand strap, it requires different fingerings when playing melody than on the button accordion.
Right manual:
In the manual originating from the bisonoric bandonion, the C fingering on the right can only be used for 23 of 38 notes (61%) (black). The lowest (blue) and highest tones (red) are placed in the three outer rows.
This creates three areas with different logical structures: the C fingering (black) and the semitone steps of red and blue withthe same pitch direction (low at the top, high at the bottom). Red and blue differ the direction in which they are played: in the case of an ascending pitch, the row changes inwards for blue and outwards for red.
The Manoury-System is identical in all tones on the right side.
Left manual:
The same can be found conveniently on the left side (incl. Play direction for blue and red; only #g1 is outside of the system). 21 from 33 tones (64%) follow the C fingering (black).
Charles Péguri was a visionary, because he created a mirror image of the C fingering on both manuals, which greatly reduced the learning effort. Thanks to C. Péguri, the mirrored arrangement of manuals presumbly became part of a keyboard system for the first time. This would have been the case with Praktikal, Meisel and Chromatiphon, but was not used there.
Only decades later was this principle implemented again on the single-tone accordion and Hybridbandonion.
Manoury-System: The tonal stock is 6 tones lower, for which the highest 5 tones have been replaced by 6 low tones. c2 > C, c#2 > C#, D (new key), a1 > D#, a#1 > E, b1 > F. All other tones are identical to Péguri.
Left side:
2-choirs (8'+4'), range: Fis - c2
