FM, AM, Additive, Subtractive, and wavetable.
Original instruments are better than their copies - as anyone can agree.
Anyone can note the difference between the same instrument and the same excerpt, as played by the favourite soloist or by a beginner. In these cases you can find, among so many differences, even a different sound . The PDEs governing the resonator are substantially wave equations, which admit, as a general solution, the superimposition of opposite travelling waves. More details here . Each parameter has a straightforward physical meaning, giving an intuitive support to the player.