This project is based around the Arduino DUE. We don't use the IDE anymore but our own Makefiles and libs, but the core hardware is still arduino.. 
https://www.kickstarter.com/projects/844778849/st4-hybrid-synthesizer-tracker
if there are any DIYers out there who would like to build this hybrid between synthesizer and computer. just leave a note..
we'd like to make kits available, but working on the DIY manual takes effort