Chromatic harmonicas for all requirements
Chromatic harmonicas enable the player to perform music of all keys on one instrument. At present they consist of two diatonic harmonicas in one, tuned a semitone apart - for example in C and C#. The slide button is pushed in to switch the airflow from one to the other, thus raising the pitch of each note by a semitone.
By combining these two scales, all 12 notes of the chromatic scale are available over several octaves, depending on the number of holes provided by the size of the instrument.