Quoted from Purpledrilmonkey:To my knowledge any lamp matrix with 'standard' led's will ghost to varying degrees.
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This is not 100% correct. In fact it is a timing issue in the matrix and mainly happens on WPC, WPC-S and some WPC95 machines.
Willams has changed this in newer machines. There is a patch for several games, which solves the
issue the same way Williams solved it. I have used the patch in my STTNG and ghosting is not noticable anymore.