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:
http://mybeatbuddy.com/forum/index.php?threads/cymbal-volume-on-footswitch.1621/#post-6506

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.