sesquialtera การใช้

Tannenberg's organs at that time were praised for the tones in the sesquialtera.
Several of the movements are named after organ solo stops or mixtures ( bassoon, cornet, trumpet, sesquialtera, flute, twelfth, etc . ).
The Spanish baroque composer Gaspar Sanz wrote some pieces entitled " Sesquialtera ", and I was wondering how these pieces are supposed to be played / interpreted.
The two-rank version has only the 2 2 / 3'and 1 3 / 5'ranks, but this combination is more commonly called a Sesquialtera.
It contained nine stops, Dulciana, 2 Diapasons, Principal, Fifteenth, Hautboy, Sesquialtera, and Cornet and was opened by Mr . Trimnel, assistant at Chesterfield Parish Church on 23 September 1849 . This was replaced in 1865 with a new instrument by Brindley & Foster and this was opened by George Henry Smith of Sheffield Parish Church on 5 December 1865.