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"I've had a most kind and interesting reply from Paul Hale, as follows:\n \n\n\n\t\"The Teint was a gift by Maurice Forsyth-Grant, as was the None (Positiv, now on the Swell) and the 16ft Messing [brass] Regal on the Great (now replaced by G&amp;G with an 8ft Vox Humana).  The pitches are the seventh and ninth harmonics (a flat Bb and a near-D) which can be heard in the harmonic series of a bright reed pipe (particularly the 7th, the ‘Bb’).  However, Maurice didn’t really intend it to be used liked that, but in some North European organ music of the 1950s and 1960s which occasionally calls for ‘aliquot’ stops such as this.  They were commonplace in new North European organs of that period by firms such as Schuke and Rieger  We used it but rarely, though in one section of the Nunc Dimittis of Leighton’s ‘Second Service’ it came into its own for RH ‘bells’ and the published edition of the work (which was registered with NC organ in mind - bonkers!) actually calls for ‘Swell mutations - bell-like’ at that point.\n \n\n\n\t\"A Septième rank is sometimes found on French organs and adds a little ‘pepper’ to combinations, so the ninth rank was stopped-off in the 1980s, as Edward recalls, leaving the seventh sounding.  A Sesquialtera 12.17 on the Positiv was long desired, so sadly two ranks had to go - the None and the 1ft.  They are now on the Swell, in place of the Teint, G&amp;G having cleverly divided the Teint slider into two.  They are renamed ‘Sifflet 1ft’ and ‘Neuvième 8/9th ft’.  Ironic that the Septième rank has gone, as it is probably more useful than the Neuvième, though it’s remarkable how much the mutations from 22/3 upwards add to the Full Swell - which they need to as the reeds remain in their 1980s softened state, to my ear impoverishing the organ’s exciting tutti.\n \n\n\n\t\"Blackwells have a stock of my book (Positif Press).  It’s the result of many years of occasional research in the college archives and has some fascinating historical material and illustrations, as well as a detailed description of the GDB and what has happened to it since 1969.\"\n \n\n\n\tNeedless to say, I've bought a copy!\n "
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