so if those aliasing effects are going to help, then maybe a big step will be to ADD aliasing. there are a couple of suggestions here:
http://www.music.columbia.edu/pipermail/music-dsp/2002-March/047953.html
and here:
http://www.music.columbia.edu/pipermail/music-dsp/2002-March/047966.html
i'll give them a go tomorrow.