Trying to figure out this pesky issue and I think I have finally nailed it down!
So, it looks like there is a bug when trying to dim certain LED light fixtures using MadMapper.
Some fixtures such as, but not limited to, this DMX LED Bar from ShowJockey will "go rainbow" if I dim the fixture via the group level.
If I dim via the individual light fixture, it works fine.
If I dim via the DMX Master, it works fine.
If I dim via the Master Master, it works fine.
If I have the video feed be black itself, it works fine.
However, only when I dim the group level will it "go rainbow".
Here is a video explanation: https://photos.app.goo.gl/6XBEyEksy2vtSpvd9
@ 1:40 to skip to the good stuff...
Worth noting is that this happens regardless of MAC vs Windows, regardless of MM 3 vs MM 4, and regardless of DMX Interface (it's been a long day...).
We really need to work this out as we had this happen during a show recently where we had a MIDI knob dimming the entire stage via a group level mapping and they would go rainbow when we dimmed. Yikes! Some fixtures would stay true, others like the Scenografix by Showjockey, or some of the moving head lights, would... "go rainbow"!
I know this is kind of a weird edge case but we really are looking for any insight into why this is happening.
For instance, what could be different about dimming a light fixture vs a group?
Any help is super appreciated!