Hi Lonewolf10....
I have managed to get 24 colours in the back ground by creating 3 small screens (64-high, each 8 colours) and positioning them down the screen one after the other. I then open a large screen (320 x200) then call the dual playfiled command with large screen on top with the first small screen I created first. You can actually see all three screens underneath the large one! But!, all the colours are screwed up on the small screens. I know it is working because I use "Print Screen 1, Print Screen 2" etc on each screen and you can clearly see the text underneath the large screen.
I am trying to figure out how the Actions Replay cartridge manages to resize the width of an amiga screen so that I can do the same for the 3 small screens in AMOS. If I can do that, then I can match all the bit-planes up properly and I could have 24 colours on the back playfield.
Still experimenting.......