Wow! I think I got a bit lost with all that MIDI detail, but it will be very useful in the future. Now I understand a bit more about the instrument side (I think). But my immediate problem is the computer interface. There was an article on this in the Techplus magazine of October 2002 on making an audio CD recording. It is fairly straightforward in some ways, but ends with the cryptic message: "the process with ... PR604 pianos is actually far less complicated still, but that is a story for another day." What I actually want for an outcome from the PR604 is a wav file that I can convert to MP3 eventually via Nero (or an MP3plus file that is in the correct format: stereo (or dual mono), 80 bit, 44.1 kHz) so that it will be of good quality and compatible with my other music files so that I can cut, paste and edit it in Nero wave editor to use as a soundtrack. The computer software that came with the PR604 exceeds expectations in terms of lack of documentary explanation or support.
So, putting together what you have all said so far, I need to hook up the computer with a USB cable. No problem. Then what?
Leo.