in antix-faq on fluxbox > basic configuration a question is listed twice:
I want to configure my monitor--how do I do that?
The easiest method is to use the MEPIS X-Windows Assistant. Click Menu --> Terminal to open up a shell, enter su and the root password, then type
mxconfig
For details on this application, see the MEPIS Wiki.

Thanks for pointing that out--that was supposed to get fixed and just got missed, I guess.

Glad you read that far, though...