I took a look at it and am familiar with the gradient editor in Apo. Have you seen this one: [link] . The part that looks interesting to me is altering a gradient by hand.
THank you so much for putting on a live tutorial, and for participating in Project Educate! I love that you just jumped in with a really useful suggestion and planned it and did it. The chatlog is wonderful too, so everyone can see what you did and how. This will be so great for people who missed it and for future fractalists.
You're welcome!