WAV file - volume/gain adjustment?

Is there any way to adjust the volume/gain on a WAV file tied to the foot switch in a song? Or does it have to be done off-board, so to speak, in another program?

A similar question was asked here:

And yes the wav file would need to be edited using another program.

Thank you. I suspected that and it’s certainly not a problem. I have a couple of programs I can edit wavs in, with regard to setting the level.