One of the most important things to consider when buying a digital piano is the number and type of keys. Most digital pianos have 88-keys like an acoustic piano, but some models can also come as 73-key and even 61-keys versions. Choosing a reduced key-bed will have an impact on the music you can play, so we suggest opting for an 88-key piano which is higher in terms of cost but will allow you to learn and practise all genres.
Secondly, the key action is essential to develop a good piano technique. Most digital pianos have weighted keys, so you can experience the resistance and the dynamics that happen when you play a note on an acoustic piano. The advantage of this type of key is that you can develop the strength needed to move from one note to the other as you would on an acoustic piano, moreover, you can understand how your touch impacts the sound.
Fully weighted keys are balanced, meaning they have the same weight from top to bottom, Keys with hammer action are heavier in the low-end notes and lighter in the top notes, just like in an acoustic piano. Some manufacturers also offer graded action keys, that simulate the different response-dependent on how heavy the strings are.
The weight of the keys also depends on the material they’re made of. Usually, they’re made of plastic, which is less expensive and less prone to damage. Yamaha also developed “Ivorite”, a plastic that feels like ivory, to simulate the feel of an acoustic piano from the past, when ivory was the main material used for keys. This type of finished is used in most premium pianos, as it guarantees a better grip when playing.
Yamaha developed GrandTouch and GrandTouch-S keyboards, meaning that all white keys are wooden and have incredible touch responsiveness. The length between the key front and the fulcrum has been substantially extended giving the performer more leverage even when playing at the back of the keys. You will experience a finer balance, a more precise rhythm, and a smoother melodic expression.
Casio did something similar with its GP-Series. These instruments, designed in collaboration with Bechstein, feature wooden keys and moving hammer mechanisms, giving the digital piano amazing quality and authenticity.