I can identify with that, having six keyboards and a closet packed full of accessories of all kinds. Occasionally, a friend, who is not as advanced in gear acquisition, will buy one. I worry some, also, that my wife will have an awful burden on her hands. It wouldn't affect the estate much, but it would be such a shame to throw them out. It is such a hassle trying to sell anything, I just don't bother.
I think that like Chas, Russ, and others, I will make arrangements to donate them. Hopefully, when I die, they will be certified classics.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact