i try to make my looping patch with max/msp

i had made my first module but i have a little problem:

with the latency of soundcard,i had some lag between the recording sound and the playing sound....

how could calculate the time of lag??? and how could do a latency compensation system like looping software like mobius (www.zonemobius.com)

hi everybody,
i try to make my looping patch with max/msp
i had made my first module but i have a little problem:
with the latency of soundcard,i had some lag between the recording sound and the playing sound....
how could calculate the time of lag??? and how could do a latency compensation system like looping software like mobius (www.zonemobius.com)
thanks by advance for your help.
Max


calculate latency and latency compensation??