Hi, is there anyway I can change the post() output from "js" to a user-provided string, much like is possible with MAX print?

post

Also, how do I get post() to have a red-background( i.e. error message)

For question 1, obviously you can add anything you like to a post() call

Here is an example of using the error command instead of the post one.

        error(arrayfromargs(arguments), "n");

        post(arrayfromargs(arguments), "n");

var redisdead = 0;
declareattribute("redisdead");

function setTheString()
{
	if (redisdead)
		error(arrayfromargs(arguments), "n");
	else
		post(arrayfromargs(arguments), "n");
}