Martin King, on his yahoo group website, often recommends the BASTA program for baffle design. That is available free now, password is given on the site. I note that there are several other programs there, but haven't seen any recommendations for them. They do look interesting though. One is for edge diffraction, one for enclosure design analysis, and there may be another I'm not remembering currently.
I think these must have been commercially available programs that are no longer supported, and thus have been made available free.
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