actually you could change thee default music even in 4.7 or erlier i don't know i begun with 1946. just enter this path in windows XP C:\Program Files\Ubisoft\IL-2 Sturmovik 1946\samples\Music\Menu or in win vista/7/8 C:\Program Files x86\Ubisoft\IL-2 Sturmovik 1946\samples\Music\Menu and replace the old music from the country you want with your music (attention make backups of the old music and be sure that your music will have the name of the old one).
except if you are talking about a feature of sound effects.
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