Disklavier

I am trying to foind out how to reduce the level (volume) on the mark 
III when playing SPS disk qith commercial CD.
I have notice that I can reduce the level of the piano when playing 
by selected the arrow and get to the vol function (set at 100) I am 
able to reduce the piano player to sound softer by lowering the 
volume to a lower level, however this is only good for the tune being 
played and it goes back to normal soon after when the next song start.

Is there  afunction to get the piano to play softer and keep the 
level down for the whole album.  I am already playing the piano with 
the level =E0t -10db on the regular master volume control.. The TG 
master for the CD is already set to my regular value of 85, which is 
quiete acceptable in my house, but to get the piano and the CD sound 
nice together I need to increase the volume on the left control to 
high to compensate for the higher piano level, however as mentioned 
before if I lower the piano while it is playing with the arrow 
accessingthe first line of the screen I can lower this to a lower 
value but it soen't stay after the song is over it comes back to 
level=3D100.

Anyone can help, if I was not to confusing.

Jimmy