UPDATE AND SOLUTION
When using the Cab 1L and Legacy engines............if pressing the #9 button does not work for turning the smoke on.
PRESS AUX 1 - then the number 9 button. For the duration of your operating session the 8 and 9 keys function.
Page 13 of the Cab 1L Manual describes how to increase and decrease smoke volume on Legacy engines which works well.
I cannot explain why this is so, but it works.
Just purchased the Cab 1L as a back up for my Legacy remote.
All functions work on TMCC engines. Specifically the #8 and #9 ...on / off for the smoke.
However, on my Legacy 10 Wheeler, the Cab 1L #8 and #9 keys do not turn the smoke off or on.
If I set the smoke on via my Legacy remote then it is on with the Cab 1L. But no control......it just stays on.
If I set the smoke off via my Legacy remote then it is off with the Cab 1L and again no control......meaning I cannot turn the smoke on.
I've reset several times but this did not make any difference.
Any thoughts Gents?
Thank You