Is synthesizer a string instrument?
A string synthesizer or string machine is a specialized synthesizer designed specifically to make sounds similar to that of a string orchestra.
What is the Karplus strong algorithm?
The Karplus-Strong algorithm is an example of digital waveguide synthesis. An instrument is physically modeled and simulated. In this case, the random samples crudely represents the initial pluck: each part of the string is in a random position moving at a random velocity.