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.
Upright pianos can also. be categorized by size and include the spinet (36 to. 39 inches), the console (39 to 42 inches) and the. studio (42 inches or higher). The console piano is. the most common upright found in homes. Digital pianos are electronic instruments that. reproduce sounds that have been âsampledâ and.