# Reply To: Neo-Geo sync problem

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#23321
Harrumph
Participant

The values are related such that h.samplerate = h.active + h.frontporch + h.sync + h.backporch. H.frontporch is calculated from the other values, so make sure you have not adjusted the values so that h.frontporch becomes too small or negative. Also if you have decreased samplerate, it’s probably a good idea to lower h.sync proportionally.