Unfortunately foo_dsp_xover 0.38 cannot be complied with current SDK without (small) changes in the source code. So I made them, but didn't tested thoroughly. Caveat emptor.
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Added 2010-04-08: official foo_dsp_xover plugin ( http://sourceforge.net/projects/xover/files/ (http://sourceforge.net/projects/xover/files/) ) was updated to ver. 0.42.
perfect! was looking for this for hours. works ok for me. have you tested your version against the 7.1 channel error? thanks for sharing!