The 7th Guest initializes GM devices during the "loading GM drivers"
screen, which is a normal video that plays "audio" that consists of
initialization messages (mostly Roland GS sysexes). The original
interpreter plays this video twice, which is enough time to play the
entire INI_SC.XMI initialization file. ScummVM apparently plays video
a bit faster, and there is not enough time to play the entire init
file. Because of this GM initialization is incomplete.
I've fixed this by making the init video loop until the audio has
finished playing.
Note: I have only tested this with the original DOS version of the
game. I don't know if the file reference I've used to identify the
GM init video is the same on other platforms. If not, this change
might not work and/or have unintended results.
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