GUSMASK_LINE_IN
(sc->sc_mixcontrol & GUSMASK_LINE_IN)) {
sc->sc_mixcontrol &= ~GUSMASK_LINE_IN;
(sc->sc_mixcontrol & GUSMASK_LINE_IN) == 0) {
sc->sc_mixcontrol |= GUSMASK_LINE_IN;
sc->sc_mixcontrol &= ~GUSMASK_LINE_IN; /* 0 enables. */
sc->sc_mixcontrol & GUSMASK_LINE_IN ? 1 : 0;
m = GUSMASK_LINE_IN|GUSMASK_LINE_OUT; /* disable all */
(m | GUSMASK_LATCHES) & ~(GUSMASK_LINE_OUT|GUSMASK_LINE_IN));
(m | GUSMASK_LATCHES) & ~(GUSMASK_LINE_OUT|GUSMASK_LINE_IN);