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Sound options: Separate sliders for battle music and ambient music
After speaking with fellow Baldur's Gate fans, I found a common annoyance was the battle music. However, none would turn it off because that would also turn off ambient music, which all love. Also, battle music was perceived as playing much louder than ambient music.
I suggest having separate sliders for the two types of music, this way people who find that battle music plays too loud compared to everything else can set it independently, and those who don't want any battle music can turn it off completely, and still enjoy the beautiful ambient themes.