Sorry to read that you are having some problems using Cuety.
I did some test here and selecting the Chauvet Slimpar Q12 or the Generic RDBA in both case I was able to see and control the amber channel.
Could you check the firmware version of your LPU ( going in Cuety's options). It should be 1.31,
If not you need to install Vmanager to upgrade the firmware.
You can find Vmanager here:
www.visualproductions.nl/downloadIf once your LPU updated it still doesn't work, you can send me your show file at: support"at"visualproductions"dot"nl and I will have a look at it to see it I find any problem with it.