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The big unknown is whether the wood moisture content has reached equilibrium with the present surroundings.

If the wood still has some moisture change, typically to loose moisture, before reaching equilibrium, then the cracks will continue. Epoxy or any type of glue is not going to be able to prevent the wood from further cracking.

Check the moisture content of the wood, ideally by weighing over a period of weeks. If the wood is not losing weight, it has reached equilibrium and now the cracks can be filled with epoxy.
 

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Dave, this wood is actually rather old, and is from a pipe organ built in 1867. It has been sitting in its current location since 1912. Do you think 100+ years in the same location would have caused the wood to reach equilibrium?
 

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If the cracks are as big is what was illustrated then it probably needs to be re-enforced from the back side if possible. I normally fill a wide crack by mixing bondo with a universal tinting color so it looks the color of the finished wood. You just need to mix the color a little less red to allow for the red hardener when it is mixed in.
 
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