Kendall,
YOu do not have to put a song into the sequencer in order to change sounds .Once the file is copied onto the hard drive ,
You start playing the song .
Press F1 for GM parts .

The sounds used will show up in the screen .
Use the Functions buttons to help scroll to the correct part . Once you have the sound you want to change highlighted , press the guitar sounds ( if not already there) and select the carlos lead .

Once you make the adjustments , stop the song .
Press save/enter and rename the song .
F10 to confirm .

You do not LOAD a song into the sequencer , You COPY the song . Perhaps this will help a little to understand terminology .

I think that the Korg products you would always load vs Ketron products is copy !

YOu copy a song into the sequencer , not load! dano