Daystate Mechnical noise.

In pursuit for more stealth and no experience with electric(battery) airguns like Daystates I have a question for the gents on this forum. I have a Daystate Revere which is fairly silent with a silencer. Actually the mechanical valve noise surpas muzzlenoice. Is an electrical controlled valve more silent?..

An observation. I have reduced the power to 15 ft/ibs and have noticed if I use a heavy slug like 16 or 20grain slug the mechanical noice is slight less than using a 8,44grain pellet. Maybe the valveslam is less?...(it sounds like it)