minor problems with record~

I'm using record~ to record the output of a 4096 point fft generated
with fft~. I'm putting record~ in loop mode so that each spectrum
will overwrite the previous one.

I'm experiencing two minor problems:

- I can't set the the proper loop start and end point in record~
before audio has been on once. (the reason why I want to do this
before is that I want to make sure that frequency bin 0 corresponds
to sample 0 in the buffer). In order to make it work correctly I have
to switch audio on and off once, then give it the proper loop points
and then switch the audio back on.

- I have to give record~ a loop endpoint that corresponds to 4098(!)
samples in order to make it overwrite the same 4096 frequency bins
that are coming out of fft~.

maxmsp version 4.6.2

best,

Edwin