INT 61 - Atari Portfolio - MUTE STATES                                          
	AH = 18h
	AL = function
	    00h get mute state
	    01h set mute state
	    02h get key click state
	    03h set key click state
	    04h get beep state
	    05h set beep state
	    06h get alarm state
	    07h set alarm state
	    08h get DTMF duration
	    09h set DTMF duration
	DL = new state ("set" functions) (00h off [muted], 01h on)
Return: DL = current state ("get" functions) (00h off [muted], 01h on)
SeeAlso: AH=15h"Portfolio",AH=16h"Portfolio",AH=17h"Portfolio"
SeeAlso: AH=19h"Portfolio"