In the late 1960s Hohner marketed two instruments designed by the late Cham-Ber Huang, the Chordomonica I and the Chordomonica II, designed to play melodies with full chordal accompaniment.
The Chordomonica I was essentially a retuned 10-hole chromatic harmonica, with some of the chromatic tones sacrificed n order to give appropriate harmonies. With the slide in the 'out' position, blowing gives a C major chord and drawing gives a G7:
With the slide in, blowing gives an F major chord and drawing gives an F# diminished 7th chord:
The Chordomonica II had 12 holes and also gave the C major and G7 chords with the slide out:
Not surprisingly, it also gave the F major chord an F# diminished 7th chord with the slide in:
However, the Chordomonica II was also equipped with a second slide which selected notes from both the upper and lower reedplates of the harmonica to give the additional chords of A minor and D minor 7th:
As well as the key of C, both models were also available in the keys of E, F, G and A. Here is a chart of the chords produced by each key of instrument:
|KEY||BLOW||DRAW||BLOW +SLIDE||DRAW +SLIDE||BLOW +SLIDE(2)||DRAW +SLIDE(2)|
Both models were discontinued by Hohner some time in the early 1980s, although they often turn up for sale in places like eBay. Cham-Ber Huang wrote an instruction manual for the instruments, but this is long out of print, however there is an arrangement of "Bury Me Beneath the Willow" for the Chordomonica I in the book "Folk and Blues Harmonica" by George Heaps-Nelson and Barbara Koehler (a beautifully illustrated book, which also contains lots of other useful stuff for beginners and intermediate players - click here for more details from Amazon.com).
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