Yamaha Portatone PSR-84 Owner's Manual page 39

FEATURE REFERENCE (Demo)
To give you an idea of the PSR-84/PSR-85's sophisti-
cated capabilities, it is programmed with 3 demonstration
songs that you can select and play.
1. Press the DEMO [1], [2], or [3] button to start playback of
the corresponding demo.
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2. Press the same DEMO button a second time or the
[START/STOP] button to stop demo playback.
The demonstration will play continuously until the
A
DEMO button is pressed.
* If the MIDI MODE is set to "99," it will be reset to "00" when DEMO
playback is started.