Hello, this time was to video the work landscape.
The tool uses Audacity, but similar things can do the same.
Please enjoy it.

1. First, read the sound source
2. Listen to the song and calculate the BPM manually
3. Unify the BPM of the two sound sources Start work after roughly matching the starting point
4. Enjoy your work

If you encounter an unexpected problem during work (for example, the chord progression timings of songs do not mesh), you can think of using materials from different chord parts.
Not everyone can do that from the beginning, and fortunately there are many ways to express this in Audacity, such as pitch, decibel strength, and EQ.

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