I have it on a second tier, above my Korg SV-1 in the studio, and you should hear the expressiveness of the pianos when you play it, with the keys of the Korg piano (thru midi). It's a great rig, and when I have a quick one-nighter, I just take the Yammie off the rack, and off I go.
Hi Dave, so it makes a difference,
I was a bit stretched for space in my 3rd bedroom/music room , also, so had to put my p121 in the living room. Since Pa4x, pa3x, psr S950 are all gone now ( wall to wall keyboards, crazy haha) I will have space for p121. May actually try and see if I can set the 2 up via midi. Read about someone doing it over on psr forum a while back.