Yamaha RY8 Owner's Manual page 30

The word "PTN" (located next to the number of the currently selected pattern) will be
flashing, indicating that you can change the pattern number.
Press [-1] and [+1] to select a Preset pattern (between #000 ~ #199). (The
pattern numbers between #200 ~ #249 are for User patterns, i.e., patterns
you create yourself; the User patterns for a new RY8 will contain no data.)
To play the selected Preset pattern, press [PLAY]. The selected pattern will
play repeatedly until you press [STOP]. To continue the pattern playback
from the stop position, press [PLAY] again. To start the pattern again from
the beginning, or top, before pressing [PLAY], you must press [TOP], [BWD]
or [FWD] to return the pattern to the top.
SELECTING "NEXT" PATTERNS.
While a pattern plays back, you can designate the "Next" pattern to play
immediately after the current pattern finishes.
To select the Next pattern, while the current pattern is playing, simply press
[-1] and [+1] to designate the Next pattern. (This is a good opportunity to
step through each Preset pattern and hear each one!)
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