There are walkthroughs out there that tell you the password for each Slig voice lock. The Prima guides do, but they’re books that you’d have to purchase, probably off eBay. It would certainly help to know whether you’re playing
Abe’s Oddysee or
Abe’s Exoddus. There are some guides on GameFAQs that may be of interest to you. Try
this one for
Oddysee and
this one for
Exoddus; then all you’ll need to remember is which buttons give the
high grunt
and
low grunt
.
Hope this helps.