Basmellanregister
Basmellanregister is a term used in musicology and organology to describe a specific type of sliding mechanism found on some pipe organs, particularly those from the Baroque era. This mechanism allows for the selective engagement or disengagement of certain ranks of pipes, effectively changing the tonal color or volume of the instrument without stopping the entire wind supply. It is distinct from a stop knob or lever, which typically controls entire divisions of the organ. Instead, a basmellanregister often operates on a smaller scale, affecting only a few pipes or a single rank within a larger division.
The primary function of a basmellanregister is to provide subtle tonal modifications. This allows the organist