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37
Performing
What’s the feet?
“Feet” is a term that began as a measurement of the length of the pipes in a pipe organ.
The pipes that produce the basic pitch (fundamental) for each note are considered to be
“8 feet” in length.
Therefore, a pipe producing a pitch one octave below that of the reference of 8' (eight
feet) would be 16'; for one octave above the reference, the pipe would be 4', and to take
the pitch up yet another octave it would be shortened to 2'.
The pitches of the harmonic bars are related as follows.
On tonewheel organs, the high-pitched footage for a portion of the high range, and the
low-pitched footage for a portion of the low range are “folded-back” in units of one
octave.
Folding back the high-frequency portion prevents the high-frequency sounds from being
unpleasantly shrill, and folding back the low-frequency portion prevents the sound from
becoming “muddy.”
On the FP-7 faithfully simulates this characteristic.
16' 8' 4' 2' 1'5
1
/3'2
2
/3'1
3
/5'1
1
/3'
one octave
below
5th root 8th 12th
15th
17th 19th 22nd
8' =
When the middle C (C4) note is pressed, each
harmonic bar will sound the following notes.
FP-7-e.book 37 ページ ２００６年１２月１４日 木曜日 午前１０時５７分