Anthem serial command with variable

//VARIABLE 
CHAR  nTUNER_PRESET_NUM
CHAR  nTUNER_PRESET_BAND

//CODE
BUTTON_EVENT [dvTP_TUNER,13]
{
	PUSH:
		{
		nTUNER_PRESET_BAND = 1
		}
}

BUTTON_EVENT [dvTP_TUNER,14]
{
	PUSH:
		{
		nTUNER_PRESET_BAND = 2
		}
}

BUTTON_EVENT [dvTP_TUNER,1]
{
	PUSH:
		{
		nTUNER_PRESET_NUM = 1
		}
}

BUTTON_EVENT [dvTP_TUNER,2]
{
	PUSH:
		{
		nTUNER_PRESET_NUM = 2
		}
}

BUTTON_EVENT [dvTP_TUNER,3]
{
	PUSH:
		{
		nTUNER_PRESET_NUM = 3
		}
}
BUTTON_EVENT [dvTP_TUNER,4]
{
	PUSH:
		{
		nTUNER_PRESET_NUM = 4
		}
}

BUTTON_EVENT [dvTP_TUNER,5]
{
	PUSH:
		{
		nTUNER_PRESET_NUM = 5
		}
}

BUTTON_EVENT [dvTP_TUNER,16]
{
	PUSH:
		{
		SEND_STRING dvTLP1, "'TFP',nTUNER_PRESET_BAND,nTUNER_PRESET_NUM,$0A"
		SEND_COMMAND dvTP_TUNER,"'@TXT',70,nPREAMP_BUFF"
    CLEAR_BUFFER nPREAMP_BUFF

		}
}