Yamaha Electone EL-37 Owner's Manual page 40

Chords Recognized in the Single Finger Mode (Key of C)
Major, minor, 7th and minor 7th chords can all be played in the Single Finger
mode.
Major chords: Press the root of the chord (the note that corresponds to the
chord's name).
Minor chords: Simultaneously press the root and any one black key to the
left of it.
7th chords: Simultaneously press the root and any one white key to the left of it.
Minor 7th chords: Simultaneously press the root as well as any black key
and any white key to the left of it.
PLAYING SINGLE FINGER CHORDS WITHOUT RHYTHM:
Auto Bass Chord is generally used with rhythm patterns to create full
rhythmic accompaniment, but it can also be used in the Single Finger mode
to add full continuous chords to your performance without the use of the
rhythm. Simply leave the rhythm off in Single Finger mode, and play Single
Finger chords from the Lower keyboard.
Chords Recognized in the Fingered Chord Mode (Key of C)
C
Cm maj7
Cm7-5
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C
Cm
C7
Cm7
Cm C7
C+5 C7+5
C-5 C7-5
Cm7 Cmaj7
Cdim C7sus4
C6 Cm6
Chord Roots on the Lower Keyboard
G A B D E
F G A B C D
Minor, 7th and minor 7th
chords with black key roots
NOTE
(such as B or G ) are played in
the same way as those with white key
roots.
With Single Finger, the chord
produced will sound in the
NOTE
same octave regardless of
where it is played on the Lower
keyboard.
If you forget to cancel the
Single Finger or Fingered
NOTE
Chord accompaniment
functions, single notes that you play will
sounded as continuous chords.
E