Ok, I noticed that the audio didn't exactly match the original video I just watched. I intended to raise the pitch of the audio, but it turned out that the tempo had also sped up along with the pitch. To resolve this, I replaced the original audio with a new version that accurately matches the video's tempo. Now it works really well. I hope you guys like it!
Credits to everyone, including the British Broadcasting Corporation (B B C) for the audio, @some_guy_whos_here and @ovalcreatives for the original projects!