Artist's conception

I originally thought it would be fun to give this instrument some amount of registration, so I built it with alternating hard and soft hammers, with the idea of sliding the rail side to side to select which hammer was used.  

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Two stroke

The idea was the hammers were skinny enough so sliding the rail back and forth would allow the actuator to lift only one of the hammers.  I gave up on this idea because I just couldn't imagine having enough force to move that heavy rail fully-populated.