OPL_KEYON_BIT     528 dev/ic/opl.c   	rB0  = (block_fnum >> 8) | OPL_KEYON_BIT;
OPL_KEYON_BIT     566 dev/ic/opl.c   	opl_set_ch_reg(sc, 0xB0, voice, v->rB0 & ~OPL_KEYON_BIT);