One of the things about aa_macro's syntax is that because commas are used to separate parameters, and because processing resolves all internal aa_macro language from the inside out, is that you can't really embed actual commas in text.

This demonstrates a way to get around this using the  [fref]  command and the hex=1 option of the  [resolve]  command. Because  [resolve]  does its replacements the very last thing in text processing, and because the hex=1 option allows you to specity any character string, you can go back and replace anything you need to. In this example, it is used to place a comma everywhere one is needed.