When the Link To Tempo option is enabled, the LFO rate is set to the Pro Tools session tempo, and any tempo changes in the session are followed automatically. When Link To Tempo is enabled, the LFO rate slider is ignored and the tempo displayed in the LCD always displays the current session tempo.
The Duration selector works in conjunction with the session tempo, LFO rate, and Beat Clock trigger. By default, Duration is set to 1 bar. At that setting, the LFO cycles once within one bar. When Duration is set to 1 beat, the LFO cycles within the duration of one beat. When Link to Tempo is activated, the Duration selector sets the LFO rate as a function of the tempo of the Pro Tools session. The Duration selector also controls how often the Beat Clock trigger is activated.
The Tempo Display displays the tempo in BPM. The value in the Tempo Display can also be edited directly by clicking it.