This tutorial shows how to receive ModSyncs on spawned GameObjs without any coding. BassLink is tool available in Unity Asset Store to link events in any mod music to your game. You can get it here: [Not yet available]
It would be great to allow BASS_SYNC_MUSICINST based syncs for BASS_MUSIC_NOSAMPLE loaded mods. So we don't need BASS_SYNC_MUSICFX events anymore to duplicate these syncs.