I want to make a simple 3-into-1 MIDI adaptor for my Rolan MKS-50. It will only ever get input from the keyboard OR the sequencer - never both at the same time. The other input is going to be only Sysex data from a PC running a real-time patch/bank editor. If I just run them together will the data collide? Is there a way to do it not using a microcontroller?