I suspect that my bbd is damaged, is there a sure way to check if it
it working properly

I was having a go at the standard flanger patch from the bbd manual
(page 12) and after playing around with the variables, it seems to not
giving a bbd output...

Now repatching it doesn't seem to affect the sound at all...

Any advise would be great since i cannot fault find too well as i was
only just figuring out how the module works.

Thanks...