[Question] How do you change the pitch and volume of a BattleBGM?

[Cheese Master]

By that I mean how do I make the pitch and volume lower for my Gym leaders battle?
(it's the bottom guy in the image by the way)

 

[Scyl]

A simple work around would to be use "change BGM music" in the event commands; you can modify the volume and pitch in there.

Alternatively, you could just open the file in an audio-editing software like Audacity and modify the aforementioned settings in there.