OPL_FEEDBACK_CONNECTION  320 dev/ic/opl.c   	opl_set_ch_reg(sc, OPL_FEEDBACK_CONNECTION, v, p->ops[OO_FB_CONN]);
OPL_FEEDBACK_CONNECTION  538 dev/ic/opl.c   	opl_set_ch_reg(sc, OPL_FEEDBACK_CONNECTION, voice, fbc);