I use it for 6 months I have already registered with. I think this instrument is just revolutionary because it allows you to play full chromatic color preserving alterations of diatonic harmonicas simple leaf that did not allow nor overblows that by forcing us to narrow the light between the plates and blades alter significantly the color of the instrument or the valves that allow for altering course without vrément get the same stamp with an alteration since with a normal deterioration "valved" no blade is sought.
I greatly appreciate the XB-40, G Ab A Bb F and low. colors that can be obtained above are fabulous. If I may try to play a board in tones that are unusual about this instrument (playing a harmonica in F, G for example) you will discover all see the possibilities and all the colors that the XB-40 lets get it!