HELP!!...need to know how to interface my D-20 with my MC-303 and my DR-202 Groovebox via Midi. I am very new to this and have a porrly written manual for the D-20. I tried to use it with my DR-202 and could only get a few sounds to come from the keyboard. How can I assign the Keys to the different sounds in the 202 and the 303?.. Is it possible to do this?...Please help..Thanks in advance!!