Mentioned only in passing by Irwin, who says only that the �Salicional Diapason, 'Cello Diapason, and Violone are also hybrids�. In this case, the hybrid is presumably between the 'Cello and the Diapason. Examples None known. Contributions welcome. Bibliography Irwin[1]: Violin Diapason. FOOTER Original site compiled by Edward L. Stauff. For educational use only. CelloDiapason.html - Last updated 15 February 2000. Home Full Index