A misalignment of a tape recorder head, around its vertical axis.
"Dear Cristian, Just a quick note to say "thanks" for the terrific work on my most recent order (3 lps to cd). And for all the work you've done for me thus far! The quality has been consistently "excellent". I'm very fortunate to have found you and your company! Had searched a long time for a vendor who does the work you do. At last, mt ..."