I want to create a macro to decrease color saturation by 10%.

Try this:

[Select Last] {Saturation} [At] [/] [90] [Enter]

-Todd

That worked Thanks. What I really want to do is decrease the saturation by 10% each time I press the macro. Can't figure it out.

How about:

[Select Last] {Saturation} [At] [-] [10] [Enter]

That would take it down 10 points each time, not by 10% of the current value as in my other example.

-Todd