Different sounds on pops is normal.
Do you have your ground mods done?
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Probably a good idea to do them. It will make the game much more reliable.
Make sure the original battery on the MPU has been replaced with an off board battery.
See this recent thread where grounding of this machine is discussed. You will also find a link there about how to accomplish the grounding mods.
http://pinside.com/pinball/forum/topic/black-hole-maintanence
See pinwiki also for more info. Just Google it!
Good luck!
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