awesome, that worked well!
there was 1 or 2 extra .encode's in prs-500.py around line 211 (not sure if i put them there or not, i was trying something along the lines of what you did, but python must have known i was a noob) and the edit marks for r120 caused some problems, so I just got rid of them (and the old lines)
unfortunately Ot4 hasn't been aquafied, and i haven't tried to set it up in darwin yet (not sure if that will work). so i couldn't check out the hard work you've put into the gui
Thanks for putting all this work in!