A viola oraganista was a ___ machine

electronic

mechanical

What refers to the distance between two sound frequencies or pitches?

According to the article in wiki answer, digital communication systems have more benefits than analog systems. they are faster and more flexible, and they offer better performance than analog communication

Where is the photographer’s signature generally located? centered at the top of the photograph on the side of the photograph in the lower right hand side below the photograph photographs are never signed