I noticed that when you use a bent toy to play a sample at a very low pitch value, a few interesting artifacts start to appear.
I never hear those artifacts on a software sampler no matter what interpolation method is used.
My guess is that it has to do with the pulse coded signal not being filtered and entering the audible range.

I have been trying to replicate the effect using pure data : the patch.

Audio demo :
It sounds very harsh compared to actual bent toys but I think it is interesting nonetheless.