Check out the AccessECU Tuning Guide Thread (www.cobbforums.com)
There is a PDF linked in there, and it explains Dynamic Advance, Dynamic Advance Multiplier, and Ignition Advance toward the end of the document.
You may be able to find a few more definitions in the StreetTUNER Manuals available on their site.
Total Ignition Advance =
Primary Ignition table value for the corresponding RPM and Calculated Load breakpoint. + (DAM percentage * DA table value) for the corresponding RPM and Calculated Load breakpoint. +/- value in Knock Learning table for the corresponding RPM and Calculated Load breakpoint.
This adjustment is made to the Dynamic Advance value and can be seen in a datalog. If your DA value for a particular load point is 8 and your DAM is showing as .50, then you should log a 4 as your DA value. If you do not see 4 in the logged value for DA, this means the Knock Learning table has been populated with a value or your ECU made a final adjustment to ignition advance because the ignition advance for that particular condition (RPM & Calculated Load) is too close to threshold.
+/- adjustment make by ECU within Knock Detection range. Within the Knock Detection range, the ECU can
make a final adjustment to remove ignition advance is it hears the engine noise is getting too close threshold.
There are definitions before this, but what you see above is how they work together.