Inspired by a forumer's support thread, I came up with a way to keep playing the current map's randomly chosen BGM while visiting what we could called here the child maps or dependent maps.
There is a way to prevent the game from playing the vehicle's BGM as well.
Instructions
Leave a Random BGM Note in the Main Map's Notebox like the following:
Ruby:
<switch SwitchID bgm Bgm1 Bgm2 Bgm3>
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NOTE: Keep in mind that you should MANUALLY turn off that switch right when exiting the so called Main Map.
Leave a No Vehicle BGM Note in the Main Map's Notebox:
Ruby:
<no vehicle bgm>
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Now you can simply use a script call to turn off the Main Map's game switch.