<HTML> <BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT= : 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">As a general rule, if unisons g= o out it's your technique, if the intervals >go out while the unisons stay solid, it's the environment.  There a= re, of >course, always mitigating factors</BLOCKQUOTE> the other day I was called back on a piano I had tuned at the end of June. S= everal unisons were way off. I know that the humidity level changed drastica= lly. (The owners went away for a month leaving the piano in a very hot house= , came back and turned on the evaporative cooler) What surprised me though i= s that of the 8 or 9 trichords I adjusted it was always the right string tha= t was off, the lower pins in other words. The whole piano was sharp of cours= e but the intervals were pretty much ok except for one octave in the bass.<B= R> So what do you think is it my technique? is it because the right strings are= shorter that they behave differently? Do you use a different technique for = the left and right strings? the piano is a Yamaha U1 Jean-Luc Matton</HTML>