"popular myth that the in-out action of the melodeon gives the articulation you need. To play musically needs some notes staccato and others legato, and the choice should be made by the player to suit the phrasing of the music, not by the mechanics of the instrument."

Yes - actually if you have played keyboard before, ESPECIALLY a pipe or other 'organ' rather than a 'piano' it will all be used!

I make the distinction, because the piano is a 'percussion' instrument, same as a harpsichord is a 'pluck' instrument, which still has a percussive type sound. Organs, and other wind instruments, have a totally different feel, and attack on the key movements.