There certainly is a way to correct wrong notes. Load the sequenced song and locate the measure where the error occurs, then>(go to)program menus>sequencer>record & edit>note edit. On the lower left corner press RT1 and run the measure out to the error measure,highlight the wrong note and use the note button to raise or lower the note to the proper position. Exit once and press RT2 if you used two voices, then do the same thing again. Exit out of the sequencer, press play and check that the error was corrected properly, then save your song to disk. You can also play a few measures after you change the notes while you're still in the sequencer, if you want. The more you use the editor, the easier it gets, and there is a bunch of other things you can do to make a bad song good. Happy recording!