thanks to both of you for replying! @spacelordmother that was a great idea, i had checked there before- unfortunately i think it was a modified version by someone on the forums that only got shared on a discussion thread. i haven’t been able to find anything about it by searching the discussions though (the search is pretty weak).
@elquinto - that would certainly work, but this was specially edited so that depending on orientation you could access the full range of button presses (including longer notes and stopping a column) on the grid and there was a little toggle box to click in the app to switch between vertical and horizontal. kicking myself for not saving it back then. i have a pretty good collection of apps over the years but never archived apps for the 128….