Mellotronists

The only one I ever saw was at Kean's house when he lived in Moses 
Lake. It made a BIG, BIG sound! Scared the tar out of me! It was pure 
and loud! I heard only something like eight were ever made, and the 
guy who invented/made them was living the rough life in a trailer 
park in Florida or something like that. Biro is the man!! I wonder 
how he connected with the mere handful of bands that used the 
Birotron.