that was fun, thanks! i think i get the format, just need to learn the words. MrC's page, to anyone searching, is a good resource for this.
MrC, in case you read...in your post
~limit=-1,1,[Artist] ~limit=-1,2,[Decade]
Result: plays 10 tracks, 2 from each of the decades (a custom field) and the same artist appears only once.
why does the 2nd 1 point to tracks? can it be defined, i.e. -1,1,1 for artist, album, track? or restricted to f,n...?