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This is difficult to know if the composer didn't explain it. 

John Cage (the father of prepared piano) left detailed instructions about what object had to be inserted in every chord, even at what point (length).

The sound of the piano here at the beginning is homogeneous, so I think it could be some large object put on the strings (metallic stick)...

I'v seen many different techniques: ping-pong balls left free over the strings. The bowed piano is also beautiful.

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Quoted from Wiki

"The piano is prepared by inserted coins between the strings in its upper register as well as being electrically amplified creating a ‘church bell’ sound". 

So the "amplifier" refers to the electrical amplifiers.

But the source is in a book and I have no access to it. 


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