Reply To: True TZF? Home › Forums › Products › Stompboxes › True TZF? › Reply To: True TZF? January 21, 2010 at 10:04 pm #119823 achaputModerator If by TZF you mean Through-Zero Flange, then yes, there is one in ModFactor. It can be accessed in the Flanger Effect via the Type Knob.