AndalongDudigual

Hello, I am part way through the completion of my MIDIbox FM synth, and would realy like to add an onboard polyphonic velocity sensitive keyboard to the mix. how would I go about doing this? I plan to use 24 or 25 momentary style switches, for about two octaves of notes. it would also be nice to use two aditional buttons or a rotary switch to be able to change the 2 octaves up or down. can the DIN module accomplish this? would I require a second core? pre-emptive thanks.