Yamaha Disklavier E3 Quick Reference Manual page 9

Recording to a USB Flash Memory
1
Insert a USB ash memory.
2
Select "USB1" as the destination.
[ SELECT ]
3
Start recording.
[ RECORD ]
Flashes
4
Start playing your song.
5
Stop recording.
[ STOP ]
SELECT
[ CURSOR ]
>>
[ PLAY ]
>>
Lights
>>
Lights Lights
[ ENTER ]