Here's the mix again, with both tracks set to Volume Mixing: Average and Volume: 1.0. In that mode, OpenShot will automatically average the volume of all playing tracks so that they don't exceed 1.0, which certainly works to prevent clipping. The other thing you can do, if you prefer not to deal with manually adjusting levels, is set the Volume Mixing mode for both (all) of your tracks to Average. (And then plan to go back and tweak things some more, if the final result still doesn't sound exactly the way you planned.) So, just make the necessary adjustments right from the start. Unless the track volumes are reduced, you KNOW there's going to be clipping, whether you hear it or not. Don't assume that there won't be clipping, and then plan to correct for it only if you hear distortion in the preview. Long story short, when mixing audio from multiple sources, you have to reduce the input levels to prevent clipping. If you were to play the preview back with the volume set to 100%, you'd notice that both tracks were far too loud, leading to distortion every time their combined amplitude attempted to exceed the maximum levels for your audio hardware So, there's plenty of headroom left in the output hardware, and the signal doesn't come anywhere near maximum amplitude - never mind exceeding it. The reason you don't hear clipping when previewing is, you most likely have the output volume on your computer set far below 100%. There's still a little visible clipping, but just like with the original guitar track, none of it is audible. I adjusted the guitar track to 0.75, and the crowd-noise track to 0.8: Here's the same mix, only this time I set Volume adjustment keyframes on the first frame of each clip (so the value applies for the entire length of the clip). The trick is to simply reduce the volume of both tracks, so that they don't push each other beyond max amplitude when mixed together. So it's no surprise that when we mix in another fairly loud track at full volume, the clipping increases drastically: (The red lines represent clipping, with View > Show Clipping enabled.) Loading the guitar track into Audacity, you can see that it's already clipping some, and that's without any other tracks mixed in: Especially if either or both of them are already close to or at the limits of their amplitude range. If you're mixing two audio sources together at full volume, clipping is a likely result. I know there is already an issue about this problem, but I wanted be more specific, in my report, provide steps and files for you to work with.
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