That is really helpful! So, do we not know the vector size until the *_dsp method then? There is EXTERN int sys_getblksize(void); in m_pd.h, it would probably be useful if we added comments indicating the usage of that if it isn't giving us the block size that we should expect in _perform

Another thing I wasn't sure about is if you need to explicitly free symbols after you gensym if they're being used for variables etc [like to get a "value"]. would be nice to add into the header docs.