JB wrote about pattr :
"Check the (probably undocumented -- sorry) "setall" message. My notes tell me that it "manually change a path's value at all slot numbers - does not send anything to the object" -- syntax would be "setall object::path ".
I tried this fonction on MAX 4.5.5 / WINxp/PC but it didn't work. May be I forget something... See the patch below.