From the now old Cobb Subaru Datalogging Guide:
Monitor: DAM
What it does: DAM, or Dynamic Advance Multiplier, is a learned correction that adjusts overall timing.
What the numbers mean: For the 02-05 WRX, this number ranges from 0 to 16. For all other turbo model Subarus, this number ranges from 0 to 1 in tenths of a decimal (ex: 0.8). The number advances upwards when no knock is detected and decreases for extreme knock situations. You always want this number to be at it’s maximum value.
Why you monitor it: If you ever see this number decreasing, you have a potential severe knock situation.
What to look for: The starting value will depend on the vehicle and tune, but it should always learn up to the maximum value. This value will reset to it’s starting point after a map Reflash, an ECU reset, or a battery disconnect. If you see this value begin to drop under any other circumstance, you most likely have a severe knock situation. You should immediately analyze the tune and mechanical condition of your vehicle.
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Monitor: Fine Knock Learning
What is does: Fine Knock Learning is a learned correction that makes small corrections to timing once the DAM has settled.
What the numbers mean: The values are degrees of timing being added or subtracted. An initial correction is typically -1.4, but is learned away in increments of 0.35.
Why you monitor it: When Fine Knock Learning hits extreme values, the ECU may start to adjust the DAM.
What to look for: Occasionally under low loads you might see an initial knock value followed by several values of that number decreasing in the incremental value (ex: -1.4, -1.05, -0.7, etc). This would mean that the ECU is already learning the correction away, and would be nothing to worry about. These values would also immediately go away after an ECU reset. If the ECU is making consistent and multiple knock corrections under load (such as full throttle and full boost) all in a row, you could have a potential knock situation.
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BTW, if you have a kill switch (required by most racing organizations) that will also kill all of the learning the ecu has done. Whenever you disconnect the battery or flip the kill switch off, then later start the car, it's best to let it idle for awhile then take the first track laps easy so the ecu can relearn before you get on it.
I've uploaded this guide and another to the links below since Cobb has moved away from supporting individuals:
Cobb Datalogging Guide
Cobb Accessport Tuning Guide