and I forgot to say, if you use [vd~] to circumvent [delread~]'s delay limitation, you will also find that [vd~] is a lot slower (taking more cpu), and that's normal, because [vd~] does antialiasing, whereas [delread~] does not.
I don't know who Karplus-Strong is, but from your dissertation I get the impression that what you call antialising here is what I would call interpolation.... ¿?