sbIRQ()

         Returns and/or modifies the IRQ of the SB

    Syntax:

         sbIRQ( nNewIRQ ) -> nIRQ

         nNewIRQ : The new IRQ that the Sound Blaster is configured for.
                   Remember that the value must be introduced in decimal,
                   translate the hexadecimal to decimal.

    Description:

         Returns and/or modifies the IRQ of the Sound Blaster. If Null the
         Sound Blaster defaults to IRQ 7h, that means that, assume the
         interruption 08h+07h = 0fh but this value can be modify by
         the switches on the card.

         Check for which IRQ your Sound Blaster has been configured
         and adjust this function to that IRQ.

    Return:

         A numerical value indicating the present IRQ

    Example:

         ? sbIRQ( 5 )    // Update the IRQ to 5 and Returns the previous