Hi Tapas, I'm glad you enjoyed Mr. Müller's playing, he's simply phenomenal, what he does with his left hand, I haven't seen anything like it.
I only wish he would have subtitles on his you tube videos, because there is so much to learn from him. He is not only an excellent musician, but also an excellent technical expert that knows the ins and outs of Yamaha and Korg keyboards.
In this link he does a demo of the Genos2:
https://youtu.be/h8mAQvY-JI0?feature=sharedA swing medley on the Böhm Sempra SE40:
https://youtu.be/_5n3OYJjmvw?feature=sharedPlaying on a real church organ:
https://youtu.be/hytsWccdfeU?feature=sharedPlaying the accordion:
https://youtu.be/dYT2UVqJ8P8?feature=shared