It's not on the printed guide, it's in ACATune.guide - which has explanations for every ACATune option and is essential reading!
If you don't have it, it's in the original package here:
http://www.icomp.de/t/bin/ACATune_V10.lha
Then there's an updated ACAtune binary you can get from here:
http://eab.abime.net/showpost.php?p=...postcount=1388
Read it
