Stereo is where you have a left and right signal, like a music cd. This will often impoet as a single track but showing left and right waveforms.
Mono is the same as stero but with the same signal on both the left and right, this will play out of both speakers.
Dual mono is where the left and right are different, often a boom mic on one chasnnel and personal mics on the other. With out changing any settings the boom will be from one speaker and the personals from the other. More often than not dual mon would be split out to twn distinct mono tracks, this will let you use the track pan pots to make the audio come from both speakers.
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