I am interested, it was he who said that this was an old discussion and not worth having. I am interested in discussing this further but I don't think that he is. His comment that he can use eigenmodes for LF is satisfactory for the problem at hand, I just dispute the use of image/ray tracing methods below the Schroeder frequency.

But no, I am not interested in using CARA, but it appears to be a competent piece of software. I have already solved the problem in question so I don't see the need to do it again.