auto mute channels when not playing

[bonzerboy]

This is a new one for me. Someone recently said it was good to auto mute your channels when there is nothing being played like between vocals or if there is a lead so you would mute before and after. I hope that makes sense. The person who told me this said when your tracks are playing and summed even with nothing them you can get build up of noise, i think that is how it was explained? Does anyone else auto mute tracks. One more note he said because some plug ins can add slight noise and many tracks will buils up so you might get some hiss or other artifacts.