John Rutoskey wrote:

> In "O" roll instruments the top 24 notes of the piano scale are
> shared also by the solo instrument or instruments.  When a solo
> instrument is activated, the corresponding solo range notes of the
> piano do not have to be cut off, but it is certainly an option since
> the piano is not really necessary at that point.

In addition, the solo notes sound an octave lower (or two perhaps;
I don't have it in front of me at the moment) than the corresponding
piano pitch.  Thus if you don't muffle the piano, you will get a
"playing in octaves" sound.

George Bogatko
http://www.intac.com/~gbogatko