Jjemig,
Ask the seller to perform a
factory reset. This is done as follows:
Press
UTILITY
Press
JOB
Make sure the
PowerOn Auto box on the screen is NOT checked
Press
ENTER
This will set the MO8 to the state it left the factory....then everything below should work.
The MO8 has four MODES. There are buttons you will see on the front panel marked
Voice,
Performance,
Song and
Pattern.
Press the
Song button and the data wheel next to the display should let you scroll through the songs that are loaded. Select a song and press the
Play button (marked with an arrow like you would see on a CD player or tape deck), it should play. Press the
Stop button, it should stop.
Then press the
Performance button. Most performances have drum parts that will start playing automatically....hold down a large number of keys across the board and you should hear some drums starting, perhaps a bass line as well.
Then press the
Voice button and confirm that it plays a single sound properly.
To the left of the keyboard are two wheels. The leftmost one controls PITCH. As you hold down some keys, turn the wheel and you should hear the pitch change. The wheel next to it is called a MOD wheel. Turn this and you should hear some change in the sound.
Press the cursor buttons, yes/no buttons, the buttons below the screen and see that they all do something.
Print this out and take it with you
If it's a private seller (as opposed to a store) the seller should be able to demonstrate all this for you.
Good luck! The MO8 is a great keyboard.