Emu XL-7 & MP-7 User's Group

I recently purchased a PK-6 and added the Virtuoso ROMs. I was
disappointed that the keyboard does not feature a "transpose"
button, which I have always found so indispensible on other keyboards
when dealing with virtual instruments that go beyond the bounds of the
61 keys. Is there a way to program a trigger button
to "move"/transpose the keyboard up or down an octave, or some other
solution? Thanks.