Premiere pro - How to lock an audio track but be able to mute and unmute

I'm on a mac and not exactly sure how it would work on a pc, but you could change the audio output pretty quickly if you've got the speaker icon on the menu bar.  control click on it and choose another output device.

I am making a Lyric video. I want to be able to edit the texts that I'm inserting. Sometimes k want to be able to have the audio unmuted si I can sync them, but sometimes I want to mute them just to edit the effects on the texts, because when I move the cursor the audio track makes an annoying sound. It happened that the audio track gets cut and moves in all this editing. So I want to be able to lock from moving or splitting; but still be able to mute and unmute whenever I need to. This should be a feature that should be added to Premiere Pro. 

Thanks for the advice. I think the only solution rather than the one you said would be to turn down the volume of.my audio system but this will take time and time is money. 

the only idea I have is to duplicate the track so you've got a version that you can mute and lock, and another that you can mute and unmute and if it gets screwed up you can simply delete the track and then reduplicate the locked track.  But can you describe what you're doing with an unlocked audio track that gets screwed up when you're editing video?  There are probably other ways of editing to avoid the problem of throwing things out of synch.