My apologies. I am using roland quad capture as my interface and my imported drum and bass tracks (and any other tracks like strings, piano etc.) are generated from Band in the Box. My guitar vst is amplitude 4. I also will mention that the loudness does vary slightly as well when it goes from the bassey sound to more treble, clearer sound. Sometimes it will fluctuate a couple times and other times it can be 3 or 4 fluctuations throughout the recording. It happens while recording and while listening to the playback.
I hope I gave you enough information.