what happened?

somehow, my track muted

Please help

I was editing a vocal track, cutting out bad parts and replacing them with good parts from different takes (tracks), when all of the parts in the track went mute except the one I was working on at the time. It’s like one part is soloed and all others within the same track are muted. I didn’t know you could mute indivual parts in the same track. I don’t know what I did to cause it or how to undo it. The track itslef is not muted, the volume envelopes are normal, just no sound from the track or activity from its meter, other than on that one part. There are no effects in use and I didn’t mess with any settings.

Any suggestions would be greatly appreciated