NighTONE satisfies those who cannot be satisfied with electronic sounds. The sound of piano cannot be experienced with a set of headphone. It is the fine feeling of resonance of the wooden case and also from the keys themselves.

The independent mult-layered felt without the touch adjustment unit is a casual option to use NighTONE. If this is the case, the let-off distance between the hammer and the string is set to one milimeter plus the thickness of the felt. The distance ranges from 3 mm to 8 mm from the bass to treble section. A silent unit generally requires 6 mm to 8 mm distance. NighTONE, without the touch adjustment unit, would not change the touch substantially to affect your play.

“Sustaining the value of accoustic piano” is the basic development concept of NighTONE. You do not have to worry about holes of bolts possibily made in the case of digital sound unit installation. The independent multi-layered felt is a unit that replaces the existing felt does not requrie any hole--no bolts, no screws, no scratch. If your piano does not have a muffler rail, the rail needs to be attached to your piano with minimum damage to your piano.

If a model or maker of the piano is different, internal design and measuremnets are different. There are models that have two sections for upper and lower sounds; there are models that have three sections for bass, middle, and treble. Even identical models have different gaps between hammers. An analogue musical instrument is so sensitive that the independent multi-layered felt cannot be mass produced. It requires craftmanship to adjust exact positions and angles of the independent multi-layered felt.