hi i am fairly new to the whole custom midibox contruction thing but a definately in need of a very custom controller and am fairly competant around electronics. my idea for a tractor controller is to use a standard 3 channel dj mixer for the mixing and use 2 turntables and 2 midi controllers for the transport/effect controls of tractor. This entails setting tractor to the external mixer setup, and using a 4 channel sound card to route the tractor deck to my mixer. here is my proposal: i have a few questions... 1) since their are two seperate control units, should i use 2 cores, or 1? 2) just want to confirm... it will be using about 50 buttons, 10 rotary encoders, and 10 pots *PER UNIT*... DIN for buttons and rotary encoders, AIN for the pots... is this correct? 3) anyone have any suggestions/edits for the layout of the controllers? THANKS so much for any and all suggestions -DJ Hoya