I'm DM-ing a group and want to introduce a somewhat dynamically shifting music track for combat where it would change from a "planning stage" theme to an "action stage" at the press of a button and vise versa, similar to what you would see in turn-based RPGs. With that in mind I'm looking for a program where I can load both of those themes and switch between them when I needed.
OS should be either Windows or iOS. Sound format preferably .mp3 but can convert to other formats. As for price I can't think of a number as I want to see all of the possibilities before I make a choice.