Source it.wikipedia.org / wiki / Harmonium
"The harmonium is a musical instrument operated with a keyboard, these guides. They were built with two manuals as well as some harmonium.
Harmonium Western
As the organ, the harmonium is typically used in church for the performance of sacred music, and comes with a few records: its tone is much less rich than the organ and so is its extension .
most popular models, the air is introduced by the performer with the action of the feet on two pedals that control the bellows. To regulate the expression can act on a command that governs the exclusion of air bellows, or vice versa, use the grips on the sides of the knees to open an additional bellows and raise the sound pressure.
Usually there is at least a union that works mechanically and serves to produce an extra eighth note. When unions are two, the first is for the lower portion of the keyboard, the second for the highest and, respectively, play action to the eighth and down the octave higher.
Unfortunately, due to the high cost of skilled maintenance required and its hard to find, the harmonium remained in the churches were gradually replaced by electronic keyboards, organs, and in some cases have a stamp and a grace that is in no way comparable with that of this tool. "
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