We have 3 Presonus Firepods daisy chained together that we are using to record birds in a specially designed room for our biological research. Currently for our setup we have XLR condenser microphones that require 48V phantom power plugged into the front of the firepods and are recording 44.1 @ 24bits. The sound experiments we are conducting (sound source levels and propagation) require all microphones to be recording at exactly the same levels. When I originally bought these units one attractive feature was I was told that they were "sweet" units and are very easy to adjust the trim levels to each microphone, such that I could be sure they were all standardized to record at exactly the same. However the trim adjustments on the front, even when set to the same place all are seem to be recording a slightly different level. So my question is how can I be sure all channels are standardized to record at exactly the same level?