There seems to be little agreement on the definition of these names. Locher and Wedgwood describe Suabile and Suavial as names for a soft-toned Geigenprincipal, usually of 8' pitch and starting at tenor C. Hopkins & Rimbault describe Suabe Flöte as a wooden 4' stop with inverted mouths and a clear, liquid tone, starting at tenor C, and attributes its invention to William Hill. Grove, however, describes Suavial and Suabe Flöte as �a narrow-scaled 8' or 4' metal stop popular in southern Germany, Switzerland and the Habsburg countries from c1710 to the early 19th century.� Bonavia-Hunt calls Suabe Flöte a 4' Clarabella, and Maclean describes it as a small-scale metal flute, sometimes harmonic. Audsley considers Suabile to be a synonym for Soave, a different stop. M. Philbert, by way of Audsley, describes Suavial as a German Swiss celeste of Salicional scale, intended to be drawn with a Flute or Bourdon, and of very soft tone that is absorbed by the stop drawn with it. The name comes from the Latin suavis, meaning �sweet�.
Osiris contains a dozen and a half examples of Suavial, all at 8' except for one each at 16', 4', and 2'. Only one example of Suabe Flöte is known, and none of Suabile. Contributions welcome.