One of the hefty technical innovations that helped to beget the intact of the coincident piano was the use of a strong iron frame. Also called the "plate", the iron frame sits atop the soundboard, and serves as the primary bulwark against the compulsion of string tension. The increased structural integrity of the insensible frame allowed the use http://www.readingkeyboardmusic.com/ of thicker, tenser, and more numerous strings. In a modern fine the total string tension can approach 20 tons.
Since the 1980s, digital pianos have been available, which capitalization digital sampling technology to reproduce the sound of each piano note. The best digital pianos are sophisticated, with features including working pedals, weighted keys, multiple voices, and MIDI interfaces. However, with such technology, it was difficult to duplicate a crucial aspect of booby trap pianos, namely that when the damper pedal (see below) is depressed, the strings not struck vibrate sympathetically when other strings are struck, as well as the unique instrument-specific mathematical non-linearity of partials on any given unison.