I really don't why it is like this.

Anyway, this have been quite a nice surprise to use the expr instead of anything else. Because when an expr block is banged it seems that is "reading" (?) the number2 objects which are feeding the expr inlet but without even touching the number2 objects once you open a patch.

I know use expr object with small bang object beside it. Every bang of this type receive a global loadbang. And it work ... while keeping the number inlet opened. ...

Ok, back to work I am just trying to catch up something with fractional delays and block convolution which drive may crazy because it consume time!!!