#define SRATE	48000.0
#define SFREQ	(1/SRATE)
#define SMAX	32767.0
#define ABUFSZ	1024

typedef signed short sample;
typedef struct Abuf Abuf;
struct Abuf {
	uchar buf[ABUFSZ];
	int fd, p;
};

void ainit(Abuf *ab, int fd);
void aput(Abuf *ab, signed short n);
int aget(Abuf *ab, sample *n);
void aputd(Abuf *ab, double n);
int agetd(Abuf *ab, double *n);
void aflush(Abuf *ab);

double miditofreq(int note);
double miditophase(int note);
double voltomul(int level);