CMS_IREG_OCTAVE_1_0
reg = CMS_READ(sc, chip, CMS_IREG_OCTAVE_1_0 + OCTAVE_OFFSET(voice));
CMS_WRITE(sc, chip, CMS_IREG_OCTAVE_1_0 + OCTAVE_OFFSET(voice), reg);
CMS_WRITE(sc, 0, CMS_IREG_OCTAVE_1_0+i, 0x00);
CMS_WRITE(sc, 1, CMS_IREG_OCTAVE_1_0+i, 0x00);