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i can barely hear Y&L over the cheering crowd. Is there any way to reduce their singing and raise Y&L's voices?
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Valito, what you're asking for is a multistage process :
1. demux
2. transcode audio to an uncompressed format
3. edit
4. transcode to a lossy format
5. remux
While the rest are easy (if not naive) tasks, step #3 is quite tricky. One would have to isolate the right frequency bands and attenuate all leftovers. AFAIK you can accomplish that, properly, only with professional software. Many $ and/or the right skill...