The FFT-based binaural panner is not an external, but rather a project that consists of a couple of Max patches and 43 pairs of HRTF-subject files to be read by jit.matrix~.
It was created in 2011 as part of a thesis on the possibilities of binaural synthesis in combination with head-tracking, in an aesthetic/experience-oriented context. In the thesis project, the FFT-based binaural panner is a small, but essential, part of a larger construction in Max, involving sensor-based head-tracking, room simulation, configurable sound- and listener positions etc..
The project also includes a HRTFSubjectMatcher sub patch, which relies on a java external ('HRTFSubjectMatcher.class'). The HRTFSubjectMatcher tries to match the entered listener measurements with the subjects in the CIPIC database. However it must be mentioned that it is by no means scientifically valid, but might serve at a rudimentary tool for selecting an appropriate HRTF file set.
Jakob Hougaard Andersen