[PD] waveshaping with a lookup table (idiot question)

[james holden]

hi all,
i'm new here, and with pd generally. ive been doing my best not to ask 
too many idiot questions but here's the first..

i'm attempting waveshaping using a lookup table and tabread4~. my table 
contains a linear ramp at the moment. but:

what i've noticed though is with a small table (100 points) i get a 
distortion that sounds like bit-depth reduction. it goes with a larger 
table. surely though, if tabread4~ interpolates this shouldn't happen? 
have i just made a buggy patch or is there a finer point i'm missing?

thanks,
james