I suppose you are running a Pd version which doesn't have the [list] objects yet. Older Pd versions still allowed you to create a [list] object, but it was non functional.3. How can I found out all this list stuff? It's undocumented in my PD version... I never heard of [list append] or [list prepend] before, they seem to work but I can't pull up any help files on them.You need to update your Pd. If you cannot do this globally, you should at least install some version of Pd-0.39 for testing purposes. [list] is exxxxxtremely conventient. After you've tasted its sewwt odour, you don't want to go back to list-less Pd again.