This function will change the pitch of the sound that is currently playing through playFile().
The larger the value, the higher the pitch.
1.0 is the baseline value.
pitch: float, indicating the pitch of the sound currently playing.
Robot.beginSpeaker();//Initialize the sound module
Robot.beginSD();//Initialize the sd card
Robot.playFile("melody.sqm");//Play the original music come with the robot.
Robot.tuneWrite(1.4);//40% higher than default