Søren Bovbjerg wrote:

So, in other words, single sample feedback is not possible in PD?

no, it IS possible; just have a look at the example patch : there it is done. (btw: i hope you are using linux ? the winversion of zexy z~ does not support the variable delay; dunno why i never have done this) if you give the signal-domain IIR-filter a delay of 1 sample it will do exactly what you want (anyhow, if you give it a delay of n samples it will do exactly what you want too...)

congratulations: this is very first time, that my "dirac~"object turns out to be useful (although i remember that günter had very strong doubts on this exactly 2 years ago...) you can easily see, that the you are doing single sample feedback, when the impulse response of the dirac~pulse is a smooth line

mfg.dsa.tds IOhannes