I don't remember Gulbransen making any two-manual Pacemaker organs.  I
was active in selling Gulbransen organs when the Pacemaker series was
being produced.

I did see several with an organ player attachment made by a company in
Illinois.  The units played 88-note piano rolls.  There has been dis-
cussion on the aftermarket player system in past MMD posts.

You might look at the player parts of your Gulbransen for the company
name, but unfortunately the company is no longer in business.

Don Teach