Hi Richard et al, I highly recommend back covers on uprights. Again tonight I had a piano that no note had moved more than 2 cents on any note. The last tuning was in January, 2000. I feel that this allows both sides of the sound board and the wooden frame to become steady state sooner. With every piano I have added on a back cover, the level of pitch stability has improved. Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts drose@dlcwest.com http://donrose.htmlplanet.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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