i once spent $600 on logic audio, and the matrix editor was the only bit i really got into. haven't seen a good one for pd, so i thought i'd have a go designing my own.
you need the [image] extrernal, which is from the ggee library. pd-extended comes with it.
also, sometimes the first block in the editor window doesn't appear, so you have 3 options, either click on the bottom left hand corner of the blue and white grid, press "clear" and hopefully a little red box will appear, or if all else fails, load my atest.txt file and then delete or move notes to your own preference.
sorry, my patches are invariably useless to other people, because i tailor them to my own needs.
but i thought it might be a good one to share.