[M&M] Specific Roll Macro

Im trying to make it so that when a macro rolls a 1d20-9 (With a minimum result of 0), it is then added to a list of other values. if possible I would also like it that if it rolled 0 or less I could display "Failure". I have used Maptool before, and have some baby experience with java, but I don't get how it all comes together here on Roll20. Any help?

First, a question. By add to a list of values, do you mean that you want to make a table of rolled results (will require a custom API script) or do you mean that you want to add 1d20-9 to a series of attributes (e.g. 1d20 - 9 + Armor & Dodge). This can be accomplished by the following: /r 1d20-9 +/- @{attributeName} See the  macro wiki for information on keywords that are useable for directing the attribute call to a specific character. For the displaying failure, you can use the  comparison syntax , although it won't display failure, it will display "0 Successes". If you wanted something besides the roll result to pop up, that would require a custom API script as well.

The former. I'm using M&M and simply put the better a character rolls for his power activation, the higher the DCs are for the opponent to save too.