This doesn't seem like it would be complicated but I am at a loss....all I want to do is take the first main piano sound in the unit GrOno concert and save it at the first empty user location U 21...then take P-15 ( preset 15 stringspiano) save it at location u-22 and be able to control the volume of the strings in that preset with one of the sliders on the keyboard..... That's it for now..... Thanks in advance! Lg