According to the CP88/CP73 Data List booklet (available for download) the instruments can Receive Key-Off Velocity, but the keyboard does not generate the message.

Thank you so much, Phil.

In the AWM architecture, we have key-off samples (but I don't remember if the element responds to release speed or not).

I'm 100% sure that at least Rhodes piano sounds have key-off samples in CP88. In Montage and Motif pianos also have them.

Not having the chance to play with CP88, I was wondering if the key-off samples in CP88 respond to release velocity?

Again, thanks for sharing your knowledge Phil. It is very much appreciated.