tubaboy, i think that you could technically put it anywhere. but i believe the best results were in the neck position but its easier for the magnet to pick up the strings, and you need to keep it away from other pickups. i would put it in the neck pocket and preferably dont use a pickup in the middle, but if you need one in the middle, put a single coil, a humbucker would be to close to the sustainer. you do this because i believe it has something to do w/ EMI. i might be wrong though so i would wait for another responce to your question.
while im here i would like to ask why we are trying to make a humbucker sustainer? whats wrong w/ the single coil. i think that the humbucker version looks way cooler. i like the look of avalons by the way. i know that you guys hav been working a different humbucker styles, but why? is there a major flaw w/ the single coil? i dont think it hums or anything does it?