This is useful for games having unbalanced SFX vs BGM volumes. It is [available in the standalone version](https://forums.launchbox-app.com/uploads/monthly_2016_11/sound.jpg.1daaf574b34952aca281a118038b5aad.jpg), but it is missing in the libretro version.
This is useful for games having unbalanced SFX vs BGM volumes.
It is available in the standalone version, but it is missing in the libretro version.