I have opened an Overture 4 piece for strings and piano in Cubasis. It is a MIDI file so I am using the MIDI mixer. When I play the song the mixer shows that it is responding to dynamics and will successfully 'mute' and 'solo'. However, I cannot move the volume sliders except they do respond when the volume is activated and adjusted in the Inspector panel, but it still does not change the volume level of the instrument. Any advice would be very welcomed.