The J.A. Custom Amadeus Basic harmonica has better response and tuning than out-of-the-box chromatic harmonicas. With a 3 part zigzag slide system the Amadeus is by far the loudest 12 hole chromatic harmonica on the market. The 3 part slide mechanism, gives the harmonica a much better slide action, but it also give the player better response and dynamics. It is assembled with screws for easy maintenance. Basic has a little bit better reed response than out of the box Amadeus.