[maxmsp] Adaptive Filters

Has anyone worked with adaptive filters in msp before?  I'm trying to implement something similar to a feedback destroyer, and the idea I keep coming back to is using an adaptive filter to do the job.  Is there an object I should look at?

I found a reference online, here http://ccrma.stanford.edu/~eberdahl/Projects/FeedbackCancellation/FeedbackCancellation.pdf, that makes reference to a Pd object that could potentially be ported over, but I'm hoping something already exists.

Thanks in advance for the help,
Jeff