If you haven't seen this page yet it's just what you're asking about - AH-4 wise.

http://home.comcast.net/~hamlakemn/ah4/ah4.htm

I seem to be having the same type of problem WG2Y posted about a couple months ago.  When I download dxlab and open commander there is no on screen frequency shown and changing the frequency on my radio has no effect either.  In fact there is no indication, in any of the dxlab programs that I've opened, that there is any type of connection between the software and the rig.  This seems strange to me since Ham Radio Deluxe works fine, proving that my interface is addequit (for HRD at least).  I've checked all the parameters for the Icom pro2 and the DX Lab program but can't seem to get them to communicate.  Any help would be greatly appreciated.  73, Eric