Yamaha RY8 Owner's Manual page 39

THE BEAT/CLOCK POSITION INDICATORS
The pattern beat/clock position indicators appear in the upper right area of
the LCD, where large inverted triangles represent each beat in the
measure, and small inverted triangles represent each clock where rhythm
data may exist. (The number of beat and clock position triangles in the
measure depends on the designated meter of the pattern.)
During playback, each beat position indicator flashes according to the
current beat location, with all beat positions flashing on the first beat of the
measure. Each clock position indicator flashes according to the current
clock location.
SELECTING A PATTERN - Position the flashing cursor over the word "PTN",
then press [+1] and [-1] to select a Preset (#000 ~ #199) or User (#200 ~
#249) pattern.
STARTING AND STOPPING THE PATTERN PLAYBACK - Press [PLAY] to start
the pattern playback. Press [STOP] to stop the pattern playback. Pressing
[PLAY] again will continue the pattern playback from the stop position.
DESIGNATING THE TOP OF THE PATTERN - When the playback is stopped,
press [TOP], [BWD] or [FWD] to designate the top of the measure. Then,
pressing [PLAY] will start the pattern playback from the top.
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Beat Position Indicators
Clock Position Indicators