Yamaha A3000 Owner's Manual page 303

AUDITION
Knob 5
Selects whether the AUDITION key produces sound only while held down, or whether it
continues to produce sound until pressed a second time.
normal
toggle
= normal, toggle
The key produces sound only while you hold it down. Sound
stops immediately when you release the key.
Pressing the key once starts the playback. Pressing the key again
stops the sound (if it is still playing) and disengages the key.
SYSTEM Function
Chapter 8 UTILITY Mode
301