Yamaha Electone BK-20A Owner's Manual - Page 8

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Yamaha Electone BK-20A Owner's Manual
Harmonics
The BK-20A has four different tonal harmonics, indicated by the numbers 16', 8', 4' and 2%'. These are
standard organ abbreviations showing the tone's pitch in relation to the fundamental (written note). An 8'
tone will sound just as it has been written.
A 16' tone (meaning that the wave length of the vibrations are
twice as long as 8', or half as fast) will provide a tone exactly one octave lower than the written note.
Similarly, 4" tones are one octave higher than the written note, and 24" tones one octave and a fifth above
the fundamental. -
ONE OCTAVE
AND A FIFTH
ABOVE
FUNDAMENTAL
ONE octave
fF
a
ONE OCTAVE
BELOW
4
4
ABOVE
FUNDAMENTAL
4
" |
FUNDAMENTAL
For example, if you press middle C, corresponding to the keys in the chart below will sound be produced.
_ Depressing MIDDLE C
E
1.
4 ————-—————
"pos
ln other words.
the 16' lever extends the lower manual
a full octave as shown bv the dotted line in the