Hey I was just wondering could you build a button LED matrix without building the Midibox SEQ? I will eventually build the SEQ but I can’t right now due to working on multiple Synthies, but it would be fun to mess with the LED matrix. Thanks for all! 
http://www.midibox.org/forum/index.php/topic,10476.0.html
Best Regards, Thorsten.
Thank you very much Thorsten, you will see this soon!