If the file is dual-channel, you can use Cool Edit Pro to adjust the volume. Both the left and right channels can be adjusted to the desired effect, and the stereo track can also be used, but the effect is not very good.
Action: In the top toolbar.
Click Effects, Waveform Amplitude, and then click Channel Mix.
An operation box pops up, and you can find an option of "voice cutting" and confirm it.
Video, I suggest you use Sony Vegas, which can also meet your later tasks.
But if the background and recitation are combined in the original production, ordinary software can't complete it.
But some professional audio engineering companies may be able to complete it.