I had this done on my JX. The upgrade was from 1984, you might be able to get this done at a Roland repair shop, but I doubt it. This chip gives the 3P dynamics response via an external keyboard. This upgrade also gives the 3P the ability to recieve midi on channel 3 as well as 1. The midi upgrade is a must to use in a multi channel synth setup, but I never used the dynamics feature, it just doesn't sound good on the 3P.