******************************************************************
reset_cp - a macro for setting of tancpx experiment
******************************************************************

reset_cp    -   reset_cp(<sideband number>, <X nutation rate>) 
                where 'sideband number' is a number of the Hartmann-
		Hahn sideband used for setting of the proton RF
		power, 'X nutation rate' is the nutation rate in Hz 
		for CP period on X channel.
		The macro sets the values of aHhx and aXhx so that:
		H nutation rate = X nutation rate + sideband*srate
		aH90,pwH90 and aX90,pwX90 are used for calculation
		of the nutations rates.
		If 'X nutation rate' is not provided than aXhx is 
		set equal to aX90.
		If no arguments provided the macro sets aXhx=aX90
		and use a default sideband number = 1

                require parameters aX90,pwX90,aH90,pwH90,srate to
		be calibrated and set correctly.
******************************************************************            

