I wanted to make a simple looper, and surprisingly enough i didn't find many resources on the web. There are a few topics on the forum, but the only working stuff i've found was either with a delay line (but you can't empty it) or Katja's patch (http://puredata.hurleur.com/sujet-5021-sound-sound-looper-clear-option), which didn't work very well on my computer for some reason.

I recently found out that a simple looper could be done very easily with a single table, provided that it's length was a multiple of the block size.
I 've written a post on my blog about it, and I thought i'd share it here because i suppose it could be useful for other people.

Here it is : http://guitarextended.wordpress.com/2013/08/05/making-a-looper-with-pure-data/