Originally posted by Blind Devil
@containercore: Didn't notice anything odd with SFX in there, but I do have an idea of what can cause it, as it's also noticeable in levels like Ice-Floe Inferno and Shivering Cinders. It's related to instrument tuning in the respective songs. Since the same tuning method was used for the song of this level, all is a matter of manually rewritting notes and have no pitch tuning commands to be used.
Yeah it's not an 'error' per se, just raises the question in my head why the noteblocks have been reskinned with a bass clef but they don't produce a note in the bass range.