I’ve just tested mine, everything’s fine. Two things you might want to try:
1. if you keep the game on external storage, make sure you’ve requested write access for Magic Dosbox from within the app’s general settings.
2. check the sound settings, because by default, DOSBox uses IRQ7, whereas real hardware back then used IRQ5. At least my SBPro and SB16 back then, only the og Soundblaster was on IRQ7. Therefore, games with preconfigured settings might not have working sound right away.