This setting was removed from Global Settings with the introduction of V2.69.
In V2.69 and beyond, there is a standard default dim time of 8 seconds.
Available ToneWoodAmp Mode - Dim (Available on Firmware V2.40-V2.56)
To save even more battery life, the ToneWoodAmp can automatically dim the LCD screen after a
specified period of inactivity.
To manage the Dim setting:
1. Combo-click Effects and Parameters.
2. Turn the Effects knob until you see Dim.
3. Click the Effects knob.
Seconds appears on the display with a value.
4. Select a value in the range 5–20.
5. Click the Effects knob again to select and confirm your changes.