never play ONLY empty tracks

Question

Hello,

We have a musical theme running in an exploration mode of our game. All music tracks have sub-tracks with nothing inside so that there is a 50% chance something is playing or not. But it happens quite often that all empty tracks are playing, so that there is no music at all.

Please just add an option to always play at least one "loaded" track (or more) and NEVER all empty tracks, to avoid silence!