On Thu, Feb 25, 2016 at 4:19 PM, Alexandre Torres Porres <porres@gmail.com> wrote:

2016-02-25 6:49 GMT-03:00 peiman khosravi <peimankhosravi@gmail.com>:
Two example I can think of. One-sample delay/feedback for filter design etc. And real-time zero-crossing detection with sample-rate precision.

you can do that in Pd vanilla with a single object: [fexpr~]

Don't know if anybody already mentioned it, but someone on Pd's forum posted this http://forum.pdpatchrepo.info/topic/9859/jsusfx-jesusonic-external-for-pure-data which is an external that can use the JSFX scripting language and works per sample (as the author says in the forum post). He says that it's quite CPU intensive but he's working on it..