Hi Diki,

I appreciate your well thought out reasoning stating the fundamental differences between the key actions of the Piano and Organ.

On an acoustic piano, the only control the player has over making a sound is the velocity by which their finger strikes a key. There is no concept of bending a note. So the focus falls on creating the best key action that can respond to all shades of note velocity from the lowest to the highest.

Furthermore, the escapement feature in acoustic pianos helps rapid repetition of the same note.

The fact that the lower keys appear heavier is because they need heftier hammers to strike the thicker bass strings.

The graded hammer action and rocking motion of a concert grand is best mimicked by the extra-long wooden keys found in the Kawai MP11SE. These keys are 13.7 inches long pivoting over a pin. Kawai calls this the Grand Feel action.

While this elaborate action is optimized for playing the piano, it is useless for playing the organ.
In fact, there are no Organ voices on the MP11SE and understandably so.

Organ players on the other hand need waterfall style light weight plastic keys with synth action to be able to play fast passages. The Roland V-Combo VR-730 is optimized for playing the Organ voices. The key action mimics a classic Hammond. The expression pedal becomes an essential accessory to vary the overall volume.

Ideally a musician trained on both the Piano and the Organ would prefer to have the Roland VR-730 sitting on top of the Kawai MP11SE.

This of course introduces the weight issue and kills the portability.

Every attempt to combine piano voices with organ, electric piano and synth voices results in a compromise design. One cannot combine the best piano action with the best organ action. It is a matter of physics.

I appreciate the effort of all these manufacturers trying to hit the right balance between the two actions. I could see why Roland decided to put the PHA-4 action on their new V-Stage Piano. A PHA-50 action would have been ideal for playing the piano, but not so much for playing everything else.

Korg did the same with the Kronos and Nautilus using their RH-3 action. It is not the best action for playing the piano, but a workable compromise when you have to play the organ and synth voices.

Finally, nothing beats the real thing. Most classical pianists will opt to perform on a Steinway Model D-274 on stage while Organists will seek out a massive Theater Organ with multiple manuals and a pedal board to showcase their talent.