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Fun fact btw: At one point in development, as a placeholder, the entirety of ORAS's ost was just RSE's GBA ost converted to BCSTM. They're in "r49709/trunk/prog/romfiles/sound/" I think. It's also around this range of commits (48k-49k) that XY's development was finalized and ORAS's development started, using XY as a base (I think, since these commits are where ORAS shit starts to appear).