Hmmm... regarding the "100% compatible" posts I have read on this forum with regard to "multi-color effect buttons," I felt compelled to provide an example statement, that I believe is more illustrative of honesty in action...
"The Line 6 FBV can be used as a pedal controller with the Line 6 Amplify 30, 75, 150, and TT products. However the button LEDs will illuminate red only, and the multi-color illumination based on effect type is NOT supported."
You will NOT find any statement like THAT on the box, helping you to make an informed purchase.
When phrases like "100% compatible," are used in a description, it sort of (i.e. totally) implies that the are no listed features that don't work. And don't try to append any "ifs, ands, or buts" to the claim. 100% means exactly that... 100%. All. Every feature, on every listed compatible device works. And this feature is listed on the box, and my Line 6 AmpliFi 75 is listed on the box.
I apologize for my tone here (yeah, that's a joke), but the two major features I wanted when I clicked the "BUY NOW" button, were the "multi-color effect buttons" and the "single cable to/from the ampifier" features. And, indeed, there is just a single cable required from/to the amplifier! (So, I guess I got 100% of features I wanted... but not the multi-color effects buttons.)
**Frown and big sigh**...
Now, what would be really outstanding is if Line 6 could state whether or not THIS particular feature is even possible to deliver with just a "firmware" update to our existing hardware platforms. And additionally, if the answer is "Yes, it is technically possible," then any information regarding whether the Product Line Development folks have plans to implement it.
And, "No," I am not going to repost all of this at some other "idea" website or forum as I've spent way too much time trying to keep this post polite and accurate. It's your company, not mine. I've given my honest and constructive input right here, do with it as you will.