Hello
The 3rd and 4th are off by default on the 60976.

set 49 to 07 to enable 3rd and 4th addresses. also note, that F15 (4th F3) will probably not work, due to limitations. (F16 works if mapped)

How to:
Setting/changing address with the 6021Control Unit. Take it nice and slow and remember only one locomotive can be on the track.
2. Press the “Stop” and “Go” at the same time until “99” blinks in the display.
3. Press the “Stop” button.
4. Enter the locomotive address „80“.
5. Reverse + GO Hold the control knob in the reverse direction area. While holding the control knob here, press the „Go“ button.
7. Enter the CV number, eg 01
8. Active the change of direction.
9. The headlights will blink rapidly.
10. Entering a new value between 01 and 80. Eg 08, for new address 8.
11. Active the change of direction.
12. The light blinks rapidly 3 times.
13. End the process by pressing the „Stop“ button. Then press the „Go“ button.


Common CV Settings:
01 Address - value 01 – 80
75 2nd Address - value 01 – 80
17 3rd Address - value 01 – 80
18 4rt Address - value 01 – 80
03 Acceleration/Braking Delay - value 01 – 31
04 Breaking delay 01-63
05 Max Speed - value 01 – 63
07 Auto calibrate, enter 77. (don’t press stop and go)
08 Reset - value 08
49 no 07 manual enable 3rd and 4th address, no 03 auto assign
49 no 01 disables 3rd and 4th address
49 no 00 disables 2nd address ?
63 Volume 01-63 63 max