sysctl_audio
int sysctl_audio(char *, char **, int *, int, int *);
len = sysctl_audio(string, &bufp, mib, flags, &type);
int sysctl_audio(int *, u_int, void *, size_t *, void *, size_t);
return (sysctl_audio(name, namelen, oldp, oldlenp,