The complex combinators with the colon are described on the
Walter SDK page. They only there as a convenient way of cleaning up code (they don't do anything special) and I've stopped using them myself because they always make my head hurt when I come back to my code.
Code:
+:val1:val2 -- val1*(first expression) + val2*(second expression)
They're annoying and it doesn't matter because you're using them wrong anyway
Kill 'em, kill 'em all!
folderstate is very simple; its just a number; the number of folders deep the track is. So if you do:
Code:
set button + [0 0 20 20] * [23 0 0 0] folderdepth
then your 20x20 button would be drawn at 0,0 and then bumped right by 23 pixels for each folder depth it was at. So, for a track 4 levels deep it would be:
Code:
set button + [0 0 20 20] * [23 0 0 0] 4
--which is--
set button + [0 0 20 20] [92 0 0 0]
--which is--
[92 0 20 20]
folderdepth does this for the track in question
maxfolderdepth does this for the maximum folderdepth of
any track in the project.
----
Also, I think mister happy is right; you don't need any folderstate business at all, so you can dump that too.