Buzz heard in multi-track playback but not in Waveform Editor

I'm very new to both Audition and audio recording/editing in general. I have a feeling the buzz I am hearing was from a power source too close to the mics when recording, but in editing I am only hearing the sound while in the Multi-track editor. When I listen to the individual files in the waveform editor, the buzz can't be heard. Any tips? Thanks!