The Kelstone has a unique dynamic muting system.
It allows the player to mute the strings and still use both hands to hammer or fingerpick and strum.
The sound is very unique and emulates a bit the palmmuting on a guitar.
It can help to make the lower strings sound bassier.
The overall muting of the strings (like on the guitar) to eliminate unwanted sounds is done by both hands, not by this muting system.