Dear List, Lasse Scherffig and me have made a small change to the pix_buffer in GEM. With the message cyclic 1/0, you get a cyclic behavior of the buffer. Maybe it is worth considering to include. You find the sources and a testpatch here http://www-lehre.inf.uos.de/~lscherff/pdstuff/cyc_pix_buffer.zip. Cheers, Florian Grond