sc_rlastintr     2115 dev/audio.c    			lastdelta = t - sc->sc_rlastintr - sc->sc_rblktime;
sc_rlastintr     2129 dev/audio.c    		sc->sc_rlastintr = t;
sc_rlastintr      146 dev/audiovar.h 	u_long	sc_rlastintr;	/* last time we saw a rec interrupt */