dmrodes,

As I pointed out in the first response in this thread, and confirmed by others in the thread and from the Roland support staff, stretched tuning is an attempt to make the piano sound more natural. Your manual should tell you how to do this - John points out that in the FP-4 manual you have several different flavors of temperments and tunings to pick from.

It appears that the Roland support person didn't do their homework. It wouldn't be the first time a support jockey didn't know all of their products intimately.

But it does appear that you can choose from several different tuning settings; some of which probably sound quite wonky and why they are not used any longer for modern music. Some of those temperments are usable only in certain keys. Check to see what your FP-4 is set to - I would set it to Equal temperment. You probably will like that one.

-Scott