Transmission Line Modelling Software

Could anyone recommend some Transmission Modelling software that most accurately predicts the actual response. Out of the choices, Leonard Audio, Hornresponse and Martin J King, which does the best job? I have modeled an existing system I have and am getting different results from each. Although there is some agreement in areas.
Thanks,
 
Martin
s sw is probably the most useful but NLA. HornResp is a standby, David is here to hep people and development continues (i wish people would use the damping it provides more often), Leonard’s SW is available, but never quite finished and unsupported. The damping model does not seem to be as good as Martin’s. There is also Augspurger’s SW but it stalled in development and costs money.

dave
 
Transmission Line Software

I bought Martin J Kings worksheets a few years ago when they were still available. I guess I need to familiarize myself with them. I read the tutorial this weekend. I have used AkaBak, but couldn't figure out how to do the stuffing in the sections.

It would be great if some one could tell me how to setup stuffing in the Ducts and Waveguide elements.

Thanks in advance.