in my opinion , ì you want to have a silence keyboard you should just comeback to cherryMX or using Purple Topre (HHkb TYpe-s), Happy Hacking Keyboard is really loundly when you typing on its and that not an weak point with me, i'm using it now, lubing may reduce the sound but not much (quite a bit, and much smoother), and now i'm waiting for the HHKB Type-s to come to me.