Hi.
First I want to thank all of you who helped me for my previous question.
My question now is: Can playing simultaneously in electric piano (without a Progressive Hammer-action Keyboard, I mean the normal electric pianos) and playing classical music on regular piano, will damage my fingers sensitivity in classical music playing, which is so important for that playing, in the short term and/or in the long term?

Please answer me, of course by your opinions, but if possible, please based on your experience or by appropriate researches.

Thanks in advance!!

I had few months when I played only on digital piano that has half-weighted keys (but they were weighted). Of course you can't so freely express yourself that way as playing on the normal grand, but you can. After some time of playing such like this and without touching grand I had occasion to play on grand piano, and I needed just a few seconds to adjust my feel to the keyboard action. But after that moment, I was able to express myself very freely, almost just like all this time I practiced on the regular piano. BUT I already had good technique - I learned it on the grand.

Of course, if you mean really advanced classical pieces, you need to practice on the instrument with hammer-action keyboard. But if you want to play some extra pieces on electric in the same time, it shouldn't destroy your feel. Only problem is, when you don't practice in the grand, and your instrument has non-weighted keys, and you want to play classical pieces. But in that situation reason why you can't play it is not your electric, but the fact that you don't play on the grand

Just to clear something up, "Progressive Hammer-Action" is just the name that Roland gave their weighted actions. Yamahas, Korgs, Casios, etc do not have progressive hammer-action. They have their own proprietary name for them.

I've seen "graduated action" used for Yamahas. But the names are less important than what they do.