CMS_IREG_VOL0
CMS_WRITE(sc, chip, CMS_IREG_VOL0 + voice, ((vol<<4)|vol));
CMS_WRITE(sc, 0, CMS_IREG_VOL0+i, 0x00);
CMS_WRITE(sc, 1, CMS_IREG_VOL0+i, 0x00);