Yamaha PortaTone PSR-4000 Owner's Manual page 24

Using the Accompaniment Section
SINGLE FINGER (SF)
Single-finger accompaniment makes it simple to
produce beautifully orchestrated accompaniment
using major, seventh, minor and minor-seventh chords
by pressing a minimum number of keys on the left-
hand section of the keyboard. The abbreviated chord
fingerings described below are used:
For a major chord, press the root key only.
For a minor chord, simultaneously press the root
key and a black key to its left.
For a seventh chord, simultaneously press the root
key and a white key to its left.
For a minor-seventh chord, simultaneously press
the root key and both a white and black key to its
left.
FINGERED 1 (FC1)
This is the default ABC mode. The FINGERED
1 mode lets you finger your own chords on the ABC
section of the keyboard (i.e. all keys to the left of and
including the split-point key — normally F#2),
while the PSR-4000 supplies appropriately orches-
trated rhythm, bass, and chord accompaniment in
the selected style.
The FINGERED 1 mode will accept the 34 chord
types.
FINGERED 2 (FC2)
This mode accepts the same fingerings as the
FINGERED 1 mode, but the lowest note played in
the ABC section of the keyboard is used as the bass
root, allowing you to play "on bass" or "fraction"
chords (in the FINGERED 1 mode the root of the
chord is always used as the bass root).
20
C G
Cm C
7
F
Cm
7