Audition Recorded Volume variation

When recording a voice over file using Audition having completed the recording I notice that the recorded volume on  the waveform screen fluctuates either getting progressively softer or louder on some occasions there also appears to be a wave effect along the waveform readout where the recorded volume slowly oscillates from soft to loud then back to soft. It appears that the system is hunting for sound then reacting having found sound input by me and reacts accordingly by adjusting the recorded volume up or down.

At all times during the recording I attempt to maintain a constant distance for the microphone and speak at a consistent volume. The input equipment I am using is a SE 2200a microphone via an ARC valve pre-amplifier plugged directly into my pc's soundcard.

The second issue is that when recording different tracks in the same way as described above there is quite a difference in the recorded volume from one tract to the next.

Is there something in Audition given that all things remain equal that will set the volume to be consistent both within  the recorded track and from one track to another.