please use libsamplerate (http://www.mega-nerd.com/SRC/) for
resampling. At least optional (i.e. if not installed, use your old code,
if found, then use libsamplerate)
libsamplerate, from the same author of libsndfile, is a very high
quality resampler. The best is: if Erik adds new resample-algos to
his library, ReZound would have them instantly w/o any change or
recompile. It should be easy to add it.
so PLEASE use it! ;-)