So I've got mine set up so that all the bottom keys start a loop when pressed once and it's fully lit, and a second press to dim light fades and stops loops. I've also programmed the A and B to do various functions in MainStage and have a couple of nectar MIDI pedals attached that control various volume/other parameters. I remember programming it wasn't the easiest by any means, but it's a pretty deep pedal. These are the last notes I wrote down for myself when trying to figure everything out. Let me know if this at all helps with what you're trying to accomplish and if not, let me know and I'll do my best to help.
Programming steps:
After you have activated more than one Step from a control, from the 'STEPS' option in the Control Edit menu, turn the Data Encoder to select 'TYPE'.
Stomp Switches [1]-[6] now represent Steps 1-6. The LED for the Stomp Switch which represents the Step which you are currently editing will be lit red. The LEDs for Stomp Switches which represent active steps will be lit white and the LED for Stomp Switches which represent inactive steps will be lit blue.
Now, with the 'TYPE' option selected, the LED for Stomp Switch [1] should be lit red, which indicates that you are editing step 1. If you have activated Step 2, the LED for Stomp Switch [2] should be lit white and pressing that Stomp Switch should result in the LED turning red (the LED for Stomp Switch [1] should now be white). At this point you are editing Step 2 for the selected control.
A common point of confusion is the meaning of the flashing LED. The Flashing LED is not related to Steps, rather it indicates which control is currently being edited. So if the LED for Stomp Switch [1] flashes on and off, it means you are editing Stomp Switch [1], if the LED for Stomp Switch [A] is flashing, you are editing settings for Stomp Switch [A].
http://support.nektartech.com/Support/pacer-support/Activating-and-Editing-Steps-Pacer