dsp buffers

[Tom Schouten]

hi,

i have a question about dsp buffers. i noticed that the input and output
buffer pointers are the same in all the cases that i encountered. i was
wondering if this is true in general or do you have to check for it
explicitly if you want to do in-place calculations? (saves a copy
operation). 

now that i think about it, if the input is sent to another object later
on, it will probably reserve a new buffer. is this true in general?
this probably has to do with the s_isborrowed member of t_signal.. can
someone shine a light on this?

thanks,
tom