Causes. In ALS, the nerve cells that control the movement of your muscles gradually die, so your muscles progressively weaken and begin to waste away. ALS is inherited in 5 to 10 percent of cases. The other cases appear to occur randomly.
1 The smaller studio uprights usually weigh between 400 and 600 pounds. 2  The monstrous full vertical or large upright piano can weigh as much as half a ton.  A studio piano's center of gravity is also lower than a large upright's, as it is about 4 feet (1.2 m) tall as opposed to a large upright's roughly 5-foot height.
They are called vertical pianos because of their height and the position of the strings. The height range of the vertical piano is between 36 - 60 inches. The Upright or Vertical piano is the most common piano due to its affordability, compactness and warm sound. The soundboard is vertical, strings and dampers stretching downward, hammers and dampers horizontal to the board.