video upload by Retroaktiv Synthesizers
"Playing a Rhodes Chroma with the Retroaktiv Polyphonic Aftertouch Retrofit installed. For more info, visit www.retroaktivsynthesizers.com"
Found the above video from 2017 in the following listing.
via this listing

Luca Sasdelli Switching Power Supply installed. (Replaces original PSU, which was underpowered)
Retroaktiv Polyphonic Aftertouch installed. Can also transmit this via MIDI to control other devices that support poly aftertouch.
CC+ CPU upgrade installed, allowing for CC control of parameters, extra memory, and more.
Other information:
One of the segments is out on the large 2-digit segment display (Which shows the current program selected). One segment is out on the 8-character mini-7-segment screen. Both of these segments are so minor that I have never been affected by them. One of the voice cards is currently coming up with an error. I am willing to replace the card before shipping the instrument. If I haven't played the Chroma for a month, certain keys will need to be exercised a few times in order to work. This is due to the leaf switches used on these. They're the same as the ones on the K250. I have never seen a keyboard that uses these that did not exhibit this behavior.
There is s small dent in the front panel near the Chroma logo. Hardly noticeable.
Voice 6 is currently throwing an error code."