Sizzle of the sounds old upright piano. WHY? HOW fix it DIY. #piano

The sound board is not exactly cracked, but it is loose, and it's unsticking from the piano there. When the part of the wood it's the sound board vibrates, it vibrates on top of the other one, causing the likly sound we can hearing on the video. Normally, they (both of the part wood) should ve been vibrating together as one together whole there.
It is the delamination of the sound boardof the upright piano from the basic frame (box) that occurs there. In an amicable way, you need to dismantle all the strings or unscrew loose out ALL the tuning pins it and pour it the MIXING which is half of the PVA glue after it with the smallest oak sawdust in the places of the 'dominant dissonance' where you saw and heard it.
You can do an experiment DIY there. Take liquid PVA into a syringe and try to pour it into these areas of delamination. After 24 hours, do not play the piano. It won't get any worse I'm think.

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