The 21-key kalimba extends the standard thumb piano, spanning three octaves and reaching higher and lower than the common 17-key model. This wider range opens up possibilities for more complete chord voicings, wider arpeggios, and melodic passages that span a larger register. Chord8 renders all 21 tines in the authentic alternating layout with interval coloring, giving advanced players a clear picture of the harmonic options available at every position.
The 21-key C-major layout spans B3 through B6, allowing voicings such as C4, E4, G4, and C5. The extra range also means more notes of extended chords (7ths, 9ths) may be available. The interval colors show exactly which chord tones are present on the current tuning and where the gaps are, so you know which voicings are physically possible.
The 21-key layout is popular among kalimba players who arrange pop songs and classical pieces that require a wider melodic range. The interval visualization helps you plan arrangements by showing which notes of each chord fall under each thumb. Tremolo techniques (rapidly alternating between two tines) create a shimmering chord effect that is unique to the kalimba -- the color map helps you pick the right tine pairs for each chord.