Rob, I was reading on the hi-fi non-jp1 forum a post titled "trouble with pioneer receiver." This is the problem I'm having except I can adjust speaker size, sub on/off, speaker distance, x-over, Ican do everything except adjust the levels. Apparently the answer to my problem is the code 1013 upgrade listed under VSX D509s.
My problem is that my rs 15 1918 is made for 3 digit codes. as you already know. Radio shack support does still do the modem upgrades. I called and they downloaded code 1122. They didn't have my VSX d508 listed and the RCA STAV 3970 (pioneer made) that they did have listed does everything the pioneer does conserning responce to remote commands. I have both models and no remote for either one. The light blinked twice when the download was complete, so we assumed the download was succesful. RS support said I would have to go through the code search to find the code since I could not access a 4 digit code with a 3 digit device. I still haven't found it.
Any chance I could get you to send me a WAV file of code 1013 ?