Eleven : Eleven Input Calibration and QuickStart : Set Up Eleven : Using Eleven with Pre-Recorded Tracks

Using Eleven with Pre-Recorded Tracks
If the pre-recorded tracks were not calibrated with the Eleven plug-in using the method previously described, you can use the Input control in Eleven to adjust the signal level feeding the input stage of the amp model.
Use your ears as a guide and adjust to taste. Since the Input LED measures the signal level entering the plug-in and precedes the input control, you will not see any changes to the Input LED as you make adjustments.