The white tube on the side is one of the passive water-absorbing type humidity control units. They are of minor effectiveness in my limited experience. I too have some pianos in my clientele that hold amazingly well between tunings, while others sometimes sound like they haven't been tuned in years after one only year. Patrick C. Poulson Registered Piano Technician Piano Technicians Guild -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080903/42f0f5a1/attachment.html
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