Bernie,

Going down means what it says you are going bacwards throught all the samples from where you started, try this start at strings, just key hit the peddle with you foot and it will go through all the BASS backwards and then Guitars and so on until you get to PIANO CONCERT GRAND which is the last,if you keep pressing it goes mad back into CHROME why the hell it does that don't ask. Just keep hitting the foot swicth abd you will see the group change when it's gone through all in the group, don't know why you would want to do this play, but there you have it hope it helps I just tried it for you.