hi- short question is the block size specified by command line the size of the one sample block that is handled in a _dsp function and thus constant for a session? still somehow new to pd and working on getting the right knots in and out of my brain. martin martin pi attacksyour.net/pi johann strauss gasse 32 | 7 1040 vienna ++43 699 10 44 37 42 sil.at