Yamaha Electone EL-200 Owner's Manual page 50

3
Press the Knee Lever to the right with your knee when you want to
have sustain.
Sustain effect is applied while the Knee Lever is pressed.
1 When the Knee Lever is folded up:
The sustain effect is on.
2 When the Knee Lever is vertical:
The sustain effect is cancelled.
3 When the Knee Lever is continuously pressed to the right:
The sustain effect is on.
7
50
1
ON
OFF
2
3
ON