Yes

Yes 

I just modified Count-Down (Gottlieb 1978) and added music (includes B2S  and ...)

Magna saves right = music

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I muted the sound from the ROM, you can reactivate it in the script at sound line 66

66    .Games("countdwn").Settings.Value("sound") = 0 '1 enabled rom sound

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You can also mute the music and add background noise lines 976 and 977

976    Const PlaySong    = True            'Control music playback [true -> ON, false -> OFF]
977    Const Playambience = false            'Control Ambience playback [true -> ON, false -> OFF]

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