Question

Hello, the overall tempo and pitch of the song was changed.
Since then, all the other singing projects have changed.
For example, if the song BPM 102, it is slower than 102 and has a lower pitch.

Answer 1

Hi Isaac,

That indicates that something is forcing a sample rate change, making your songs play at a different sample rate than they were recorded at.  Look at the audio files on the timeline to see if they have icons on their lower left corner which (in one way) indicates they're being processed.   If you haven't time stretched them that icon would mean they are being sample rate converted in real time.

Check your audio device sample rate setting to make sure it's set the same as the audio in your song.