Yamaha Electone EL-27 Owner's Manual page 44

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.
Chords Recognized in the Fingered Chord Mode (Key of C)
C Cm
Cm7-5 C-5
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.
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C
Cm
C7
Cm7
C7 Cm7
C7-5 C6
(such as B or G ) are played in the
same way as those with white key
roots.
same octave regardless of where it is
played on the Lower keyboard.
Cmaj7 Cm maj7
Cm6 Cdim
Chord accompaniment functions,
single notes that you play will be
sounded as continuous chords.
G A B D E
F G A B C D E
Minor, 7th and minor 7th
chords with black key roots
With Single Finger, the chord
produced will sound in the
C+5 C7+5
C7sus4
If you forget to cancel the
Single Finger or Fingered