After 6 months of continuos research , Im proud to say that I finally found the piano sound Rousseau uses . First of all , it can work on any keyboard or digital piano but your instrument should support MIDI , P.S you should have a laptop or PC and you should have a software called Kontakt , its Paid , but you can find ways to download it free but thats illegal . The Piano sound he uses is a Sample pack called CineSamples Piano in Blue , its also paid but you can also find illegal ways to download it for free , I am so happy being able to use Rousseau's piano sound and it took me a very long time to finally have it , firstly , I suspected that he uses the Steinway Grand 2 or 3 , because they were sampled Steinway Model A , and they sound exactly like Piano in blue , but I found out that the producers of this Sample packs have already deleted their website and most of the things they published. So I kept on searching and early this morning a video on youtube poped up to me and in that video a guy compares more than 20 Piano sample packs and my ears captured a very familiar sound , which was Piano in Blue , then I saw reviews for it and it sounded exactly like Rousseau's piano.So I downloaded it and I played Turkish March by Mozart to demonstrate it , I specifically chose that piece because it most expresses Rousseau's piano and it souded exactly like I wanted , but the only difference you might find is the velocity , because it feels different depending on how hard or soft you press on you key , so I suppose Rousseau adjusted it into a certain level but regardless , Im happy I found the sound I wanted and To save you the research I just told you here because the first research I did took me here to this specific post . Thank you, P.S sorry for the long post but I liked to share with you the experience , also I had alot of fun trying other sample packs and piano VST's so I advice you do the same .