Yamaha PortaTone PSR-4000 Owner's Manual page 25

FULL KEYBOARD
When this advanced auto-accompaniment mode
is engaged the PSR-4000 will automatically create
appropriate accompaniment while you play just
about anything, anywhere on the keyboard: chords,
a bass line, arpeggiated chords, a melody line. The
name of the detected chord will appear on the
display. You don't have to worry about specifying
the accompaniment chords. Although the FULL
KEYBOARD mode is designed to work with many
songs, some arrangements may not be suitable for
use with this feature. Try playing a few simple songs
in the FULL KEYBOARD mode to get a feel for its
capabilities.
NOTES
• Chord detection occurs at approximately 8th-note inter-
vals. Extremely short chords — less than an 8th note in
length — may therefore not be detected.
AUTO MIDI BASS
In this mode all accompaniment parts except the
bass part respond to the chord played on the key-
board. Fingering is the same as in the FINGERED 1
mode. If more than three notes are played on the
ABC section of the keyboard in this mode, and if the
chord played is not recognized by the PSR-4000,
only the top three are used for chord recognition. All
others are ignored. The bass part is determined by
the note played on an external MIDI bass keyboard
connected to the MIDI IN terminal and assigned to
the MIDI Bass channel (page 120).
MANUAL MIDI BASS
In this no chord recognition occurs. All accom-
paniment parts other than the rhythm part are muted,
and a MIDI bass keyboard connected to the MIDI IN
connector and assigned to the MIDI Bass channel
(page 120) directly plays the bass voice selected via
the BASS VOICE parameter that appears when the
MANUAL MIDI BASS mode is selected in the ABC
easy-setting display.
Using the Accompaniment Section
21