I need one colour for sprites too. The sprite is part of my normal pallette. i.e it is grabbed from the same bitmap as other graphics. The best I can do is get it to work with 6 bitplanes. Anything else and the colours get really screwed up and no matter how I try to load the pallette in the colours are all just wrong.
I did find that I had an AGA fix offset set (which I guess I needed when using 8 bitplanes), turning this off made 6 bitplanes possible.
I have no idea how to setup double buffering unofrtunately. Still loads to learn
