Yamaha MTX3 Owner's Manual page 19

4. When initialization is completed, power-off the
MTX3 once again.
5. Set the rear panel DIP switches 7 and 8 to the
"RESUME" position.
6. Power-on the MTX3 again.
The MTX3 will start up in its factory-set state.
Various Procedures
19
MTX3 Owner's Manual