struct AHIRequest
{
	struct	IOStdReq	 ahir_Std;		/* Standard IO request */
	UWORD			 ahir_Version;		/* Needed version */
/* --- New for V4, they will be ignored by V2 and earlier --- */
	UWORD			 ahir_Pad1;
	ULONG			 ahir_Private[2];	/* Hands off! */
	ULONG			 ahir_Type;		/* Sample format */
	ULONG			 ahir_Frequency;	/* Sample/Record frequency */
	Fixed			 ahir_Volume;		/* Sample volume */
	Fixed			 ahir_Position;		/* Stereo position */
	struct AHIRequest 	*ahir_Link;		/* For double buffering */
};