It kind of depends! When I'm having time to myself, & going for it, I often will notice, but when I'm out & about in Public, I'll be trying to control it, but sometimes it dose come out, with out me realizing, & people might make a few comments. I also often do vocal stims without realizing! I'll often say something then wispier it out loud again, & others wil hear it, but I didn't realize I did repeat it.