It is very annoying I can tell you that! There are some songs that it never would correct on and so I just had to leave those songs alone and come back to them another day. Sometimes I have to do it 2 or 3 times and it will find the correct itself. I can either cancel my song and try to restart the song to see if it works, or I just exit the app. When it real inks up there is a slight delay causing an offset in timing. When it does that, it throws off the timing of the song with the lyrics somehow. I think my internet kicks on and off randomly. I think what happens in my case, and this might not be the same with everybody.

The way I get the sink issue to go away on mine is to just shut the app down and restart it. The good news is, I don't really need to ever use that slider from what I've experienced. In time, it kept getting worse and now as you guys have mentioned, my slider is all the way to the right with no room to go! That's the bad news. This has been my number one issue since I started with Smule few months ago. Reinstalled Bluestacks and Smule and now everything syncs around 0 mark. I deleted the whole folder with the exception of those that windows warned be about. There were a lot of bluestacks files in the temp folder. As a last step I cleaned the temp folder (Press windows key and R key and type %temp%). Typed Bluestacks and blustk in search field and removed any folder or file I found. Ran CCleaner (or any other PC system cleaner of your preference to clean old registry entries). I uninstalled both using Revo uninstaller. Then I did a few things after doing some internet research about the issue. I uninstalled both bluestacks and smule several times. In precious versions, vocal would syn around 0 give or take max 80 ms. My issue was that once the song was in 'edit' mode my vocals would remain 'ahead' of the correct place and would not be in sync even if I dragged the bar all the way down to -400 ms (that is the extreme right limit). Ok let me explain what my issue was because if you are facing any other problem it might not have the same solution.

Bluestacks sound not working