PHP - Write Negated String According To Pos Tags

I've started to dabble with getID3 to write tags for use with a given audio program we use at the radio station I work for.  The program uses id3v2.3 tags for frame_name ETCO:

Here's the code that getID3 uses for handling ETCO tags:

 

		} elseif ((($id3v2_majorversion >= 3) && ($parsedFrame['frame_name'] == 'ETCO')) || // 4.5   ETCO Event timing codes
				(($id3v2_majorversion == 2) && ($parsedFrame['frame_name'] == 'ETC'))) {     // 4.6   ETC  Event timing codes
			//   There may only be one 'ETCO' frame in each tag
			// <Header for 'Event timing codes', ID: 'ETCO'>
			// Time stamp format    $xx
			//   Where time stamp format is:
			// $01  (32-bit value) MPEG frames from beginning of file
			// $02  (32-bit value) milliseconds from beginning of file
			//   Followed by a list of key events in the following format:
			// Type of event   $xx
			// Time stamp      $xx (xx ...)
			//   The 'Time stamp' is set to zero if directly at the beginning of the sound
			//   or after the previous event. All events MUST be sorted in chronological order.

			$frame_offset = 0;
			$parsedFrame['timestampformat'] = ord(substr($parsedFrame['data'], $frame_offset++, 1));

			while ($frame_offset < strlen($parsedFrame['data'])) {
				$parsedFrame['typeid']    = substr($parsedFrame['data'], $frame_offset++, 1);
				$parsedFrame['type']      = $this->ETCOEventLookup($parsedFrame['typeid']);
				$parsedFrame['timestamp'] = getid3_lib::BigEndian2Int(substr($parsedFrame['data'], $frame_offset, 4));
				$frame_offset += 4;
			}
			unset($parsedFrame['data']);

This says that I'm to include $parsedFrame['data'] as one of the array items.  The standard does not list a data field.  Also, the standard says that the value of timestamp should be HEX.  So, do I put 0011 in for 3 milliseconds or do I put 3 as the vale of timestamp?

The documentation for ETCO tags is pretty scarce...so, what I'm trying to ask is how do I write an 1d3v2.3 ETCO array for getID3?

Here's version 50 of what I've tried, and it doesn't work.
 

$TagData['id3v2']['ETCO']['frame_name'] = 'ETCO';
$TagData['id3v2']['ETCO']['data'] = 3;  // from the standard at https://id3.org/id3v2.3.0#sec4.6
$TagData['id3v2']['ETCO']['type'] = 3;  // type 3 is mainpart start
$TagData['id3v2']['ETCO']['timestamp'] = 1000; // milliseconds 
$TagData['id3v2']['ETCO']['timestampformat'] = 2; // timestamp format #2 which is Absolute time, 32 bit sized, using milliseconds as unit

$TagData['id3v2']['ETCO']['data'] = 4;  // from the standard at https://id3.org/id3v2.3.0#sec4.6
$TagData['id3v2']['ETCO']['type'] = 4;  // type 4 is outro start
$TagData['id3v2']['ETCO']['timestamp'] = 1500;  // milliseconds 
$TagData['id3v2']['ETCO']['timestampformat'] = 2; // timestamp format #2 which is Absolute time, 32 bit sized, using milliseconds as unit

Thanks!

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