I know this is kind of old news but I don't know how this got passed me. Just played the game and noticed no more sound issues. Awesome work hap. 00785 0.152: Omega Race driver cleanup (tab align stuff). Added AM_MIRROR(0x800), this fixes corrupted music after completing first several levels in Omega Race [hap].
Now I hope devs can get astro invader to emulate properly and I would be a happy camper as these 2 games I played all the time back in the day at the arcade.