buffer~ as audio rate lookup table

Hello all, I am working on an audio rate granulator and I want to implement lookup tables for control of various parameters. For this particular system, I require the lookup table to be read at audio rate, inside a poly~. I have decided to use a buffer~. Within poly the buffer is read by index~, and I can write into it via peek~. So far cpu usage has been ok, but I wanted to ask the forum about this, and perhaps there is a better solution then using a buffer. Thanks.