A musical album made by Keen On Keys with an Amstrad Fidelity CKX100 (MIDI keyboard)
-The Amstrad Fidelity CKX100 is the one and only music keyboard made by Amstrad, for more informations see this page and this other one.
Keen on Keys has made a musical album with this Amstrad CKX100 and also made a test of the MIDI keyboard on Youtube and a short preview made before the long test.
If you are curious enough, you can actually buy one being sold on Le Bon Coin.
Thanks to PulkoMandy for the information.