Kelvin,

Another way . . . . Try "file" , "open midi file" then click the green "Seq" button on the tool bar. Now find the track that holds the melody and uncheck it. Also to the right click the "edit" box, scrool down to the "change velocity" option and manually lower or raise the volume of any or all tracks if you like. Then "save as" and the new settings will be saved with the midi file.

Welcome aboard, hope this helps.

Later,