Lip Sync problems

Hi all I have been given a Zgemma-Star 2S box from a friend which has a lip-sync problem he had tried to contact the dealer on fleabay for help but to no avail, and has now gone back to Openbox.

Where in the menu would I find the settings to change the values (I must be missing something easy)

Also which is the best idiots guide to setting these boxes up regarding changing skin etc.

Thanks in advance
 
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