I finished this midibox seq v3 last year, and it turns out I quickly uploaded the MB-808 application and used it as a MIDI-MB808 only.
This is why I am considering to sell it at the moment, because I realize actually only want an MB-808 drum sequencer, so I will try to build an MB-808. This, however, costs money… 
I am hereby asking for permission to sell the seq..