This is a modern instrument I have developed to meet extreme needs in contemporary music. It has a full resonant timbre in the low range much alike some renaissance instruments. Its total range is from C4 to G6 with normal baroque fingering. Keys of very high quality are used for C4 and C#4.
I build the instrument preferably in maple wood but other kinds of wood are also possible. It is tuned to A=440 alt. 442 Hz.
It is possible to extend the number of keys with one or two to achieve a B3 and to close the bottom end opening. Equipped with all keys the instrument will have a chromatic range from B3 to G6 and many options for playing sub semitones.