That's because S3K/S3D music uses S3K's unique DAC samples and PSG envelopes. You can enable my Clone Driver v2 to use them by adjusting the settings in the Compatibility.asm file in the sound folder. A recent change to how SMPS2ASM handles S3/S3D-specific PSG envelopes may have broken compatibility with flanewing's current music/SFX pack. I can't remember if I added a compatibility layer for that. So, if you see an error for only one or two "sTones" not being defined, that's the cause.