Hi,
what are the reasons why 

a) DEFDACBLKSIZE is defined in multiple places 
extra/pd~/pd~.c:50:#define DEFDACBLKSIZE 64
src/s_audio_esd.c:71:#define DEFDACBLKSIZE 64
src/s_stuff.h:66:#define DEFDACBLKSIZE 64
?

b) DEFSENDVS is defined as 
src/d_global.c:10:#define DEFSENDVS 64    /* LATER get send to get this from canvas */
and not as 
#define DEFSENDVS DEFDACBLKSIZE
?

c) the default value for DEFDACBLKSIZE is 64 ?
On Bela I have DEFDACBLKSIZE==8 and DEFSENDVS==8 and I yet have to find troubles with this setup.

Thanks,
Giulio