Prema13,
Have you tried adjusting the volume under "ExpressScribe, Preferences, Playback"? Make a note of the current settings for volume level, volume auto-adjust, and clarity low frequency cutoff method. Then try different settings to test the result. My current settings are -8dB, None, and None, and I am getting a clean, strong recording with room to increase volume on the multi-channel display.
Please let us know if either this suggestion or the one from Chris75 solves your problem.
Cheers
Patita