Hi everyone, I'm new here and could use some help. For no apparent reason, the sound coming out of my speakers has changed. Now everything sounds like I'm hearing it from the end of a long tunnel, with a really annoying echo which increases and decreases in pitch at the end. I've checked all my sound settings, and everything is normal. It can't be the driver as it used to work ok. I've made no alterations to my pc that could have caused this to happen. I'm totally stumped and don't know what to do next. Any suggestions would be much appreciated.