1) Press the [EDIT] button.
2) On the display select a part: '1', '2', '3' or '4'.
3) Press the [ENTER] button.
4) Use the cursor buttons to cursor to 'Rcv Sw'.
5) Press the [ENTER] button.
6) Use the cursor down button to cursor down to 'Sustain'.
7) Turn the [KNOB] to 'ON' or 'OFF' as desired.
8) Press the [STORE] button, and then press [ENTER] twice to save the change.